Yes I do find that quite baffling. Even if we take everything we know about Star Citizen out of the equation, it's an alpha. The job of the folks playing it is to test for bugs. Any progress they make will be wiped. Usually alpha testers get paid BY the company for their work, not the other way around
So I'm thinking they must have some sort of "buy gun" working, or at least some mechanism in place that attracts these testers. It might not be illegal, but most folks agree that it was naughty of Tom Sawyer to trick those other kids into painting the fence for him
Maybe it's the referral system, or the secondhand market in used pretend spaceships. But I think it must be the enthusiastic supporters who wax lyrical about the game, while hiding/downplaying the fact that any progress will be wiped