Unrelated: I just realized that paypal charges a $0.30 fee for each transaction, which I am currently absorbing. Would anyone object if I shunted this to the buyer? It would raise the cost of all purchases by $0.30, regardless of the number of bitcoins purchased, so I am hesitant.
You can put a receiving paypal account into micropayment mode (google paypal micropayment) - then you're charged 5% and 5c per transaction instead of 30c + a smaller percentage.
if you expect your market to be small transactions rather than large transactions maybe that makes sense