hitbtc is selling IOU ( The term "IOU" is an abbreviation, in phonetic terms, of "I owe you.") , real tezos ICO tokens are not distributed yet. Hitbtc has a price of usd $2 per IOU - that is aprx. 5x ICO price. When real tokens hit the market this price could be meaningless..or not 
I agree that we don't know what will happen when the real tokens hit the market, but one think I want to point out is 5x from ICO price isn't crazy. All you have to do is look at some of the recent decent ICO coins that have hit exchanges.
I think if it hits the exchanges at $1 or so (2x), it will quickly rise up to the current $2-$3 range. It could also land on an exchange and trade at the current IOU price. It's a big ICO with a big idea.