I really don't make all that many image posts, and I only "lurked" 4chan on a semi-semi-regular basis right before joining GAF.
People laughed and found my posts funny, so every time a thread was derailed and people just posted image macros of cats and shit until the mods decided that the fun was over, I would upstage them all with like 20,000 funny pictures from other sites that I had stored or had made myself, since I didn't have any other use for them. It was never me that actually derailed the thread to begin with, I was just following the GAF trend and giving them what they wanted.
Everybody quoted my posts and seemed to hail me as some Obamassiah and suck my cock, so to some people I became some kind of personification of the "post lolcats and pics from 4chan" fad. And of course, GAF has a bizarre love-hate relationship with anything popular, so a third of the people would quote me and spam lolling smilies even if I wasn't doing anything funny, another third would try to critique "my joke posting skill" as if every one of my posts was supposed to be a hilarious "epic" event in GAF history, and the last third would say something like "OH IT'S CRUSHED AREN'T YOU SO POPULAR POST A PICTURE OF SOMETHING OR AN INTERNET MEME DURR" (note: this last group usually comprised of people who regularly posted 4chan pictures or memes, but stopped once I did because it was suddenly too mainstream for them).
When the mods cracked down on other people doing that shit (and the summer stupid finally ended), I stopped because there was no reason to do it anymore.
It's still funny though how many people think that I'm constantly posting jokes and image macros, even though I really haven't done anything like that in, like, half a year. Or when one-trick posters would drop their gimmick for about three posts and say that I "don't know when to stop being a joke character." (On GAF, if you naturally tend to make facetious and sarcastic comments, you're a joke character)
PhoenixDark did something like that once. Let's ignore the irony of someone, who spent months tricking the internet into thinking that his fake persona had secret information on Nintendo, criticizing someone else for "not knowing when to drop the act." That wasn't the REAL funny part. The real funny part was that he seemed to analyze my posting style as if I was a collegiate athlete and he was a sports commentator.
"Oh man, his trolling may be low, but he needs to learn how to catch the ball. manage his joking. This banning might sideline him for a while, and even affect his career and season if he doesn't walk away with some lessons about his game. Hopefully, that won't happen, this young man has some great typework and image skills, and it would be a waste if he keeps blowing it on penalties. Back to you, Chuck."