<i>Anecdote: in three years I've had six inquiries about alternate payment methods and all of them were because "I don't or can't pay online".</i><p>For Tarsnap, I've had all of four people say that they didn't want to use PayPal -- and of those, two ended up using it anyway, and one had a friend make a payment for him.  Of course, I have no idea how many customers I'm losing who never complain.