That was a really long answer to a really simple question and somehow didn't even answer it. You must work for PGI.
Your short answer: none. No beta games have test servers, further illustrating just how backwards PGI is.
Think about this for a moment: if you had just paid for and activated premium time and suddenly couldn't play the game because they released a highly unstable build to test some piece of functionality, how would you react?
Sure, you can say they shouldn't have started taking money for a beta, but then you might not even be playing the game at all because they ran out of cash to fund development.
I really don't know how else to explain it. You can complain all you want about how it's a beta inside a beta, but what's your alternate solution? Don't test unstable builds on a large scale? Don't worry about angering paying customers and disrupt whatever, whenever? Be remorseful about taking money to keep development going? Just call it production instead of beta?
Beta is a somewhat arbitrary, technical distinction. In essence, the fact that PGI has for-pay items - including premium time - in the game already, for any purposes that would matter in this specific context, it's production.
Nope. A email got sent to PGI that stated some "players" on the Forums were running out of things to WHINE about. They, as always, obliged these players and as you can see have out done themselves, yet again.
Thanks PGI. For giving those "players" a nice warm and fuzzy place they can call their own.
I don't think it's whining for people who are paying for premium time to expect a stable environment in which to play. I also don't think it's unreasonable for PGI to have an alpha build test environment that allows them to test more experimental builds in a larger scale than they can run internally and with people who are actively willing to test in an environment that they know may be wildly unstable and rampantly unbalanced.
Because they don't want to knowingly push builds that may have glaring problems or rampant imbalance, but which nonetheless have important data collection value because of scale, to the live servers? So they can take down the servers and plug in a new patch more frequently without disrupting ALL gameplay? So they can do all of this without disrupting the experience of people paying for premium time?