Well, would there be some not-sticky way of separating them after the fact? like, say, based on amount of non-trivial input they've given? There are sometimes beta "testers" who never really give any input.

For my startup, we're providing a service we'll be charging for monthly. All the beta testers will get some kind of discount we've yet to figure out yet (a few months free, most likely, or some steep discount) and all beta testers actually telling us about issues something probably double that if not more.

I guess I just don't like the idea of rewarding someone giving me absolutely nothing in return equally as someone giving me invaluable amounts of help.