I don't pay for it *because* there's no incentive to finish it (that and the fact they want $10 bucks a month just to access the current patch only). If the game ever finishes and they're not charging an unreasonable sum for it I'd gladly buy it, but yeah no sorry, not dropping that much cash on an incomplete (and likely never to be complete) game.
Baldur's Gate 3, to use an example may have done an early access run for full price, but once you dropped that price you had the whole game, including all future updates+finished product. Lethal Company is presently in early access, but it's only $10 bucks as a one-time purchase for the game and all future updates.
If a person was paying every month for every patch for this game and nothing more, they'd be set back $360 dollars for a game that's still not complete. My previous example, BG3 finished in just under three years.
So frankly, a better question is why are you defending them so hard?