How they've been doing it is people who pay $10 get the newest update right when it drops, then after about 2 weeks it goes on sale for those who spent $5. It works pretty much like a Patreon Tier system.
I'm not gonna keep paying money for a game still in development. I looked elsewhere for what I wanted and found what I was looking for.
Well, its out now. Its just 2 extra weeks, i dont see what the problem is.