When I eventually get bored of doing this, I guess. This whole thing is just a practical joke that got out of hand, after all. It won't last forever, so please don't rely on it as your sole source of income.

I'm paying you all each week/month in advance, remember? If you decide to prematurely quit showing my avatar without notice and without providing a reasonably pro-rated refund of the advance payment or other compensation, I'm going to be rather put out.

Unlikely. Not upholding your end of the deal is one thing, but other actions sufficiently unbecoming to cause you to be expelled from the club? Not a trust issue, and you'll still get your positive trust. See, I'm reasonable like that.