@Doug, just a quick note of clarification that the open beta doesn’t have to be quite as open as Cataphrak’s and mine have been.
Quoting @jasonstevanhill here, the open beta COG requires for Hosted Games does not mean “you have to post it so any rando can play without contacting the author.” It means at a minimum that the beta has to be publicly announced on the forum, and forum members who express interest are allowed to join a private message thread where they’re given access to your draft.
That will give you a better sense of how many testers are getting free access to your beta and how many of them are actually giving feedback.