I too was scammed twice and stopped selling with Paypal payment option.

But I still think that Paypal would, if really save, be best for Bitcoin exchange.

Assume Bitmarket.eu as an example would only allow someone to pay Bitcoin with Paypal if he sucessfully payed Bitcoins buyed on Bitmarked.eu with his own bank account. Confirmed by a 100% trustable seller of course.

Wouldn't something like this be an option to make the hole thing faster and saver?

A bank account is much harder to overtake than a bad secured ebay, paypal or other internet account. How should a scammer organize such a bank payment if he doesn't own the bank account?