I speculated that the IPO would last much longer (at least 6 months) and deliberated the amount to invest and managed to not invest at all. 
@xtester: what would you say now about "later investors having significantly less risk"?
@gstarcev: 6 months?! And have at least 200 very pissed-off early adopters? That's not the way to start a project...
Besides, I kept telling people: invest small, increase later. You have no one to blame but yourself, sorry.
Yup, I'm angry at myself pretty much. Ok, if person X wanted to sell stake to person Y, could that be supported and in what way?