I agree that the general public does not understand how Kickstarter works. However, we are dealing with a very specific public in this case. Namely well-monied gamers or those who support them. Someone willing to invest $5k+ in an alpha is probably not walking into the deal blindly.
The mistake most Kickstarter "contributors" make is not understanding that they are actually making an "investment" with no assured return. Any prospectus is chockablock with optimal projections which must be taken with a block of salt. This is why crowdfunding will eventually need oversight and regulation. Right now it's the Wild West and the marshall is out of town.