There is NOTHING wrong with an exchange creating a LISK market based on coins they will receive upon launch...as long as they actually deliver those LISK to their users holding the IOU token.  But whether I would actually send funds to a completely unknown exchange like bloombit.net, that is another story!  YObit, on the other hand, looks a bit more established and I might take the chance if I hadn't already participated in the ICO and was dying to buy LISK.