Actually the minimum to get the Beta is the all digital $55 package. Basically you'd be paying for a full priced game that also comes with digital artbook, digital soundtrack, Novellas 1&2, beta, and digital copy of the game.
It actually was $75 to start for the beta at one time. I even posed the question on the Kickstarter and Brian himself wrote back to me and confirmed $75 (at the time) was the min for beta. I see he must have updated it with the $55 level. I still think it's a bit much personally to ask as a min for beta access and I'm not really interested in digital extras.
You prefer chapter experience or the full story experience? Personally, I wouldn't want to play the beta and ruin the whole entire experience for me, or try to influence them how the story will turn out.
Since I hypothetically would be paying for something I would prefer something relatively soon over nothing until a long way off, especially given the fact that none of these projects are 100% guaranteed to go to completion. I'm not saying they won't but you never know. I'd feel better with sooner access to something than later.
Also, like I said before more people in the beta really does help the developer. It's not just some gift to withhold back for more money as some extra prize, it can actually be work sometimes for the player if you are approaching it from a tester mentality. I am actually one of the people who does test and report things in betas.
Anyway, unless he does an 11th hour change of heart on the beta access and lowers it the entrance fee for it, I am going to pass on this.
Oh and lastly don't count this project out for more funding yet since he may pull a Double Fine and let people continue to contribute via Paypal after the Kickstarter time has run out. Personally, I feel like this ultimately damages Kickstarters in the long term since deadline and exclusive need to mean something, but I expressed that opinion on their private forum and was mostly drowned out by the sea of people who think that Double Fine should continue to collect funds infinitely.
Also Brian may get some funds for Wasteland from other sources; we'll see.
Anyway, I will continue to keep an eye on this project and if it ends up looking promising I will probably buy the finished product down the road at some point.