One can avoid possibly troublesome sponsors by doing a search for their name on the board and reading the results. A list of boycotted sponsors would be dangerous. Possibly grounds for legal action. (I'd have to ask Hazel for more clarification though
) The boards do all of the sponsor filtering we need. I'm sure that that month old thread about Reality Cash popping up in boardtracker has done them much more than $175 worth of harm. Once they pay me, I'll start accepting galleries and sites that promote them again. I may or may not promote them, but I'm not about to tell others to avoid them.
The sites that have banned sponsors is because they were really burned by them and have proved those sponsors to be cheats. That takes a lot more than a missing check.