Ah so I wasn't totally incorrect. Is it confirmed that game breaking bugs will be piped to the Beta backers as soon as possible? or will those go to Alpha backers first for testing? Still don't understand this Alpha/Beta business, but there you go.
The way I'm seeing is that they are letting the Alpha backers have first viewing or testing of new code to highlight/flag game breaking bugs/anomalies before releasing the code to a wider premium beta backers to find the less frequent ones that are more difficult to find and replicate, with more eyes and hands it's more quicker to find and fix them.
I would imagine the majority of the beta backers are interested in the gameplay and the game itself, so they would be happier running more stable code, the Aplph backers are more likely to be more developer minded getting some satisfaction from find game breaking bugs and have the patience to put up with the frustration of testing such code.
There must be a fair number of beta backers that have the the DNA of Alpha backers, may be FD can increase numbers participating in the Alpha testing by recruiting from these hardcore Beta backers?