It's something like that, I assume that's how it works as the fee for other mining software and firmware (Claymore comes to mind) is collected in a similar fashion. It's definitely worth the 1.5% fee IMO, Blissz did a great job with his firmware and it's a true shame he hasn't done anything more since he took down his downloads. He'd be making more money if he made new software as well, and he does have a good reputation on the forums now... Perhaps it's just that he is satisfied with what he has earned through his firmware like what bclcjunkie said.