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Yours is a valid concern. But the consumer is not uniform in his/her buying patterns. While some are happy to jump on the early access wagon, others prefer to wait after gold status.
The potential doesn't need to be exhausted through Kickstarter or early access if the early birds are satisfied with what they get and spread the word.
Especially developers of a game like Starbound which is all about replayability and new features shouldn't be too worried by this model.

usually they do give some sort of thank you gift for backers but they are not obliged to. Kickstarter is about helping funding a project you like without any guarantee of receiving anything back

"kickstarters are made to fund the game because the developer doesn't have enough money to complete it"
I agree. This is exactly what I said.

"if he wastes all the money from preorderers on his project he won't have much money left."
I'm sorry, what? I'm not entirely sure what you're saying.

By the way, I am entirely correct. Kickstarter was never designed to be a store for preorders.