This is all about spammer descriptions please add some if I miss any. It pisses me off most of the time and I do prefer some over others because they're amusing. Plain and simple if you're going to spam at least add some "meat" to it, LOL!
1. The site spammer: Some of these assholes come from other websites (usually porn sites) thinking that they're going to get paid for the amount of clicks they get in response of curious "passer-biers", they usually don't get paid a cent. Some are members of the site they're spamming for trying to "beef up" their "times viewed" ranking. And still others are actually the owners trying to get their site off the ground. All are scum because they're trying to steal members from xHamster! These can last for a few days because they usually only comment on vids and most people watching the vids aren't there to read the comments (if you know what I mean, LOL)
2. The clone spammer: First off these people have way too much time on their hands. They clone a member's profile and sometimes adjust words in the profile to look like the original member but make them sound stupid. If you're not careful you'll think you're talking to the "real" member but the cloner (if "cloner" isn't a word I just made it one, LOL!) is so good it's hard to tell unless you know what to look for ie. a different spelling, a number added, words added or even description added to the original member's name. They always use the same avatar as the member they're cloning (easy to get, just click, drag and drop it to the desktop...). Once they've got all that then they start copy and pasting the same thing to everyone, jumping from members on one profile to the next sometimes changing the comment to members they have an interest in and want to "get them going". The clones usually don't last long because they comment members directly and get reported quickly.
3. The rank spammer: These are members that also have way too much time on their hands and aren't happy with the rank "Newbie", "Porn Lover", etc... They spend their days and nights copy and pasting the same crap to every member and on every vid they can find. Comments include things like "Hot kisses", "hihi", "yummy", etc... Basically meaningless nonsense that has no relevance to anything and if you comment them back about it they won't have a clue who you are and what you're talking about ESPECIALLY if they've spammed the vids! Some will even block you for catching them and saying something about it... These (unfortunately) last a very long time because they don't say "bad" things in their comments so xHamster doesn't delete them. All the members that have brains and are here for physical and intellectual stimulation can do is block them, sit back and point fingers at them while laughing and wait for them to get bored and leave...
4. The webcam spammer (these are related ti the site spammers): Have newer profiles with an avatar of an 18 or 19 year old chick taking a pic of herself in the mirror (usually) with a cute name like "Kimmie77677" or something of the like. In a matter of hours they have 600 friends and three pages of comments, many from the "welcoming committee members" but also from others that must truly believe some 18 year old hottie is sitting in front of a computer just waiting to be their friend... it'd be nice but, seriously? All they are doing is trying to get your credit card and money! (Courtesy of k**Druid)
5. The desperate-for-any-form-of-contact spammer: These post their email address all over the damn site asking for members to mail them for pictures of their cock (they seem to be almost exclusively male) which they will send in exchange for pics of your pussy! They usually come from a country with a name ending in 'stan' or places like Turkey or Greece and speak really bad English - in fact almost as bad as the 'Queens' English! (Courtesy of elNinho)
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Thanks to all that help with descriptions of the types of spammers I missed putting up :-)

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UPDATE:
Here are a few examples of spammers that are currently members of xHam posting hundreds of coms a day:
Sabinchen
AngeloAstor
wombdweller

(yes, that's his avatar)
maxwlpxs
adamski

naissa
rixs

screwyou27
kellymason
Eva-DWT
krs1961us
SM_65
Darius-is-Back
brianbigdogsmith
NOW I KNOW THIS IS GOING TO PISS SOME OF YOU OFF AND IF IT DOES, WELL, GET OVER IT AND MOVE ON! "Hi" IS A BULLSHIT COMMENT AND SHOULDN'T BE COUNTED FOR RANK ESPECIALLY WHEN IT'S POSTED ON FIFTY PROFILES WITHIN MINUETS, THAT'S CALLED COPY AND PASTE AKA CHEATING. POSTING REPEATEDLY ON YOUR OWN PROFILE HUNDREDS OF COMMENTS IS ALSO BULLSHIT AND CHEATING LIKE HERE:
http://xhamster.com/user/maxwlpxs
http://xhamster.com/user/AngeloAstor
"NICE", WOW","OK", etc... POSTED ON A VID IS BULLSHIT ESPECIALLY WHEN IT'S POSTED MORE THAN ONCE ON ONE VID OR ON EVERY VID WITHIN SECONDS LIKE IN THESE EXAMPLES (look through the comments and check the times they where made, within seconds of each other having no time to watch the vid!):
+++++++++++++++++++++++++++++++++++++
http://xhamster.com/movies/285590/flat_chested_redhead_teen.html
http://xhamster.com/movies/1556/japan_porn_movie.html
http://xhamster.com/movies/486/girl_making_anal_massage_for_her_boyfriend.html
+++++++++++++++++++++++++++++++++++++
http://xhamster.com/user/ndut
http://xhamster.com/user/adex
http://xhamster.com/user/iamhotjill
http://xhamster.com/user/kristi25
+++++++++++++++++++++++++++++++++++++
http://xhamster.com/movies/20/beach_voyeur_video.html
http://xhamster.com/movies/78/housewifes_blowjob_-_f****y_video.html
http://xhamster.com/movies/29/blonde_babe_dressing_at_beach.html
http://xhamster.com/movies/2296/hidden_cam_-_latin_babe_masturbating.html
http://xhamster.com/movies/877/amateur_hardcore_sex_-_video_25.html
http://xhamster.com/movies/1425/amateur_swingers_in_a_hotel_room.html
+++++++++++++++++++++++++++++++++++++
http://xhamster.com/movies/21/pretty_babe_topless.html
http://xhamster.com/movies/43/amateur_girl_getting_fucked.html
http://xhamster.com/movies/22/amateur_blondie_on_webcam.html
http://xhamster.com/movies/46/voyeur_video_in_a_swimming_pool.html
http://xhamster.com/movies/45/downblouse_-_i_like_this_nipple.html
http://xhamster.com/movies/3/sexy_victoria_chatting_and_stripping_on_webcam.html
http://xhamster.com/movies/4056/brunette_cutie_posing.html
http://xhamster.com/movies/5229/brunette_cutie_showing_her_tits.html
http://xhamster.com/movies/62/hot_brunette_bitch_takes_her_clothes_off.html
http://xhamster.com/movies/1100/students_-_open_air_blowjob.html
http://xhamster.com/movies/2390/webcam_-_blow_job.html
http://xhamster.com/movies/3042/amateur_girl_getting_fucked_part_1.html