And by the way, why do people keep saying "IOU" trading as if that's unusual?  The fact is, ALL trading at exchanges is based on IOUs.  If you trade BTC at an exchange, you're trading an IOU.  If you trade ETH at an exchange, you're trading an IOU.  When you finally trade LISK at an exchange, you'll be trading an IOU.  You don't think coins are actually moving from wallet to wallet every time someone makes a trade on an exchange, do you? 

As for the pre-launch trading, it's a completely natural market occurrence and there is certainly nothing wrong with it as long as the exchange has the ICO coins in their wallet for people to withdraw (if they choose) once LISK is launched.  The only question is, who knows about these 2 sites (especially bloombit)?  Are they honest?  It's anyone's guess!