My theory is there are 3 over-the-top trolls/bad posters who have accounted for 99% of the bannings
1. Dogg, as mentioned with literally hundreds of accounts and just silliness talking to himself. He's sort of harmless but insanely annoying and clogs up the board with crap. The best thing about him is that he doesn't hide the fact that it's him. His style and names are instantly recognizable. He just seems like an attention seeker.
2. Metallijay, who is a beligerent ******* who posts in huge volumes with negative crap and goes to war with certain people repeatedly. He's dumb enough that his horrendous spelling and grammar gets picked up on after he posts a few dozen nasty posts in his first few hours with a new account. He has had at least 5 accounts under which has racked up 100's of posts and several more that were banned on sight before he really got going. We used to let him try again and start over but it's been futile. He's one here and gets banned as soon as we realize it's him.
3. I think there MAY be one more person who makes a lot of the silly name "characters" (Wilnercibia, WhinyClowntista, YuDarvish, etc. However, this could also possibly be the Dogg.
I also think a few legit posters also have a "troll" account just for when they want to post some crap they wouldn't post under their usual name. This likely results in very few problems because it's so intermittent and brief.
Not 100% on the above but this is about the size of it I think