So essentially, Sony - a multi-billion dollar corporation - just asked its' own fans for $2 million dollars. Instead of you know, putting up the money themselves.
Shenmue is niche, beloved yes, but still niche IP that nobody has stepped up to help develop over the past 10+ years. Not Sega, not Nintendo, not Microsoft. Probably because it would not make them much of a profit. So why are you upset that Sony aren't committing 100% of the funding, just 70% or 80% or whatever percentage they are? It's more than anyone else has done in trying to bring this game to life.
As for the $2+ million, the people who pledged that did so in exchange for the finished game, they won't be buying the retail game when it launches. Everyone getting the $29 version now is one less $60 customer in 2017. So let's not pretend that is anything great for Sony.
When all is said and done they will probably end up with a small profit or just a breakeven. The spin that this is some kind of evil corporate scam to screw people over and make a fortune in the process is dumb as hell.