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.
It's actually depend on our interest, I do use bitcoin because I love to gamble and I do it regularly, and the fact that the rates are very low, it makes me gamble with ease and I can make transactions like even 100 transactions for a day without worrying the transaction fee, in paypal we cannot do that of course.