Easy buy of bitcoins via credit cards without verification. That's what's the best to do I think. A lot of people from the EU are complaining about that.
Terrible idea. Why would you let people buy non-reversible bitcoins with a credit card which they can dispute the charge with to essentially get free bitcoins?
Go on ebay and try to sell amazon gift cards. You'll probably get a buyer pretty quick, but if you actually send the card...they will use it and then file a "never received item" dispute with ebay and you'll lose your money, because the system favors the buyer not the merchant. This is no different than what would happen if it were possible to buy bitcoins with credit cards.
that is only one of the problems associated with this method. the other biggest problem would be trouble with fraud and stolen credit cards. that is why all these services have a window of time where it takes to verify you and make sure it is real.