I have joined performancebux for about 1 month, because they offer 27-37 ads/day although only 0.005-0.00025/ click. They wrote we can request payment when we reach 2$, but after I reached 2$, when I clicked paypal button, there was error. If performancebux is a professional site, I think they will manage their site better, like neobux or tuibux for example.