I believe an issue with current games and their "Support us at $1000 and become and Pre-Alpha tester" mentality is that you get Fan boi's that are doing the testing.
Fan boi's aren't critical enough of the game, the design choices or the timelines for which it's been laid out. A game being tested by people who won't question your choices is going to lead to a game that has bad mechanics, design implementation and more than likely game breaking bugs that weren't complained about enough that they are now forever in the game.
The current MMO I play has patches regularly but some stuff breaks. Completely breaks a game mechanic and when I, or whoever, voice our displeasure and want to know the actions and timelines, there are always people who say, "It's ok. This or that. Here's a work around. Don't worry." And if we were all to do that, say "It's ok", the game would suck. It takes criticism to ensure a game is maintained or works properly and in the case of designing a game, it (any of them) should have critics playing the game from the earliest points of implementation. But a critic sure as hell isn't going to pay $1000 to go in and criticize a game.
Pay to test is great for indie game studios, but it's not good when the creators are only hearing praise for the work they are doing, slow as it might be. Because a tester who is critical could end up losing their $1000 and not be an "invited" tester anymore.