Wanted to try and matched an existing offer. Now, I have to contact the seller to ask him is IBAN account.
Question1: how can I trust the vendor that he will accept the transaction once I send the money?
BM.eu freezes the bought bitcoins. If there are problems you can contact the BM.eu admins, they will ask for proof of the payment and resolve the problem. My experience so far is that many sellers immediately release the coins (could be due to accident) or after you told them you paid (not what I would do). If you can't agree about transaction of the euros both parties can contact the BM.eu admins to undo the transaction (bitcoins go back to seller and you don't have to pay any more).
Question2: why can't bitmarket acts like a 3rd party. You have to credit your money account/btc account (with IBAN, it will works without fee in the whole EU). That way, transactions would happen immediately without any scam possibility.
Read a few post back. BM.eu is sorting everything out with legal council, but it takes time. They just want to be sure they will not be shut down by authorities.