While the trend towards pay2beta is distasteful in general as nearly all mmo's are taking this road, it's a somewhat reasonable reward for a game that relies on crowdfunding to even be made at all. Arguments can be made supporting pay2beta to ensure a large portion of your testers have a vested financial interest in the product. As long as there's a good mix between fanboi's excusing every flaw in between salivating developers' nut sacks, delusionals expecting their every whim to be considered top priority because they paid for beta, and real gamers with a desire to see the game actually succeed, you should be ok. as long as a certain phase before open beta is available to players who have not paid a dime exists for those players to give their feedback it should be ok. "open beta, no more wipes" are really just soft launches and don't really count.
A studio that has (had) the financial backing of a major conglomerate straight up selling alpha access to a "game" that will rely on those paid players to build the assets which will be used by the studio to later build the actual game that they originally signed up for is just plain distasteful in every way. It would be like Microsoft going to kickstarter to build the next xbox. you have the money assholes, stop ripping off your fans by monetizing everything.