I 100% agree, but at the same time, this is a pretty ambitious game for a AAA studio. The fact that its being made by (from what I gather) an very small company is going to come with some caveats. Furthermore, itch isn't where people go to pick up the next fifa for 60$, its meant to help small game developers acquire funding.
As for whether or not the game ever gets "finished", the steam release *should* be a one time payment, and steam generally attracts a lot more traffic (thus sales). It really just depends on if SRT can make it to the steam release without going belly up.
Given Deluded/SRT's current situation, Im gonna go as far as to say that the "it wont make it" mentality could prove to be something of a self fulfilling prophecy. I don't think their current pricing is worth it in of itself, but if you like this game as much as I do, pay it anyway. Your not buying their demo, your investing in this games future. SRT might wanna consider having some sort of early access only content (probably cosmetic) as this sort of thing has been the death of many games. With that being said, I honestly think they'll make it. The graphics combined with a wet dream of a game (cosmetics, stats, open world...) AND a genuinely enticing story is too good to pass up.
TL;DR this game is worth shoveling money into.