As I've mentioned in my earlier post.
Any beta tester(s) whos not active, REPLACE THEM!
Hey there, each tester will use up a spot for at least a year, because Apple only let us reuse our udid allocation after a year has passed.
We are going to investigate other ways to get more udid's for testing in future, but even then our quota will be limited.
The main issue is that we have to learn what is the best method of selecting testers. It seems being the most keen player does not necessarily make a good tester because often those players will want to be playing the live game rather than testing, and i fact they would only engage in playing a beta if it's a 'fun preview' of a finished release.
So far it seems that the quality and number of the forum posts is the best indicator because it allows us to understand the player better, but in the end there is always a bit of luck with this, it's just a shame that Apple don't allow more udid's for larger scale testing.
Thanks!