I just learned of this guy's quest to become a comic book extra. It strikes me as an interesting premise in light of the fact that the largest publishers have not been putting fan letters in their books -- historically, the comic fans best chance of achieving a modicum of fame within a comic. I've made into a few comics myself but not nearly to Jeff's level. He's even got dialogue in a few issues. By my reckoning, he's already made more comic book appearances than Jack Kirby! It's kind of a clever way to be immortalized for a comic fan.
Though, obviously, it's not a tactic most people can employ. Jeff's success, I expect, is largely predicated on the fact that he's basically the only guy doing this and it's something of a novelty. I'm sure that if a wave of people starting flooding artists with requests, they'd largely be ignored.
From a bit of a geek perspective, within the context of the stories, it suggests one hell of an interesting cross-over since he's been killed once in Walking Dead, apparently revived, digitized in Tron: Betrayal and brought back out to the real world. A regular Rick Jones this guy is!
Personally, I'd rather show up in a few books that I'm already interested in than any that happen to have an artist that thinks it's a neat idea, but more power to Jeff for doing something a little different.