I do understand about the transaction fee is less in bitcoins but you miss the very important thing that is safty. If your dealing with a unknow person online then your main priority should be safty of our funds instead of worrying on small fee so when I deal with unknow people then I use paypal to pay them. Bitcoins are very safe but you always need to go through escorw to deal with unknow people.
That is the disadvantage of bitcoin, it is fast and less fee but you need to have an escrow to protect buyers. But if I have to chose between safe but will freeze your account (paypal) and fast, less fees but little bit risky (bitcoin), i'll choose bitcoin all the time.
Bitcoin should always be the best because the way paypal handles customers is very pathetic, you will have your money in the account but wake the next and find out that paypa has freezed your account which means yor money is gone forevwer or it might take you very ong time to recover it. Thats why I do not like paypal.