I think it is perfectly fine that alpha lasts 5 times longer than what people paid for, and everyone else gets nothing, not even a spinning ship although the delivery date has passed months ago.
Really, nothing wrong with it.
Do it the right way, the Frontier way
Lol. I think your problem is you're viewing the alpha as a reward being held back from you rather than a stage of development. You're not being denied something you've paid for, the game is just developing at a slower than expected rate.