The accusation that Leo left the forum due to low payrate is one of the most ridiculous ones I've heard. First things first, he had voluntarily quit from Mixtum, long before theymos announced about the mixer ban. Secondly, he was renting his avatar to Foxpup in exchange for a lot more than any signature campaign was paying.
LOL. Its because he has a genuine passion for bitcoin. I know that idea is absurd to you, but people like him actually exist. For the first 4+ years of my Bitcointalk career I wasn't in a campaign either.
Genuine passion... That's what's missing nowadays from the users of this forum. We rarely notice new such users entering Bitcointalk. It's nowadays mostly aged accounts taking advantage of their signature space.