I agree with focuspuller, I'm not a big fan of this "donate and get a clip" scheme either. Due to you advertising the fact that donors'd get a clip, no matter how you look at it, "donating" automatically becomes "buying".

I'm fine with you giving a "thank you" clip to donors, but you really shouldn't advertise that, nor even confirm it. Relying on word of mouth would've been a more correct thing to do.

Again, I don't mind you asking for donations (I've donated before), it's just that you should be more carefull how you ask for them. We're in a legally grey enough area as it is.