Okay lets say i invest 1btc in him and then what how he's going to use my btc? To buy more miners or what?
Absolutely can't buy more miners and similar things. What he want to do is to start new bitcoin businesses like changetip and so on. And to be honest, I felt like that he only wants to use others' money to invest in Bitcoin business to gain further success, instead of using his own money earned from mining.
If he wants to use the coins for something else, he shouldn't "ipo" "his" miners. If this is serious in any way, he should try to set up some sort of cloudhashing type deal or sell/lease the hashing power. I don't know much about the laws involved here, but that is probably a lot more legal, and it seems like you kind find more
suckers people willing to
fall for jump into cloudhashing/mining than jumping into a bad ipo.