Well sometimes you believe in your band so much and you think that the only thing stopping you is founding (which is sometimes is)
I say fair play to them, they obviously made an impression on him..
Granted they spend the money well (and are talented, I'm yet to hear them) they could be ok, even after 30% has been chopped off...
Who, knows, they may even split up and he'll never see his money again (although I'm sure there's some contract against this)