I don't now if paypal still stick to that "hold-my-money-for-nothing" account system, but any chance of a direct credit payment WITHOUT an account? I think it will offer more options.
I just did a recollection of all the stuff I paid for online. They aren't necessary the best around, but rather those through which I actually made payments. Just sharing my own experiences.
One thing I registered recently was Minilyrics which uses paypal and regnow. needless to say, I chose regnow.
http://www.regnow.com/Another was Mount&Blade some time back, which uses eSellerate which sets up a "webstore" (that has paypal OR credit cards)
http://www.esellerate.net/As for daopay, I think that since there is no setup cost or monthly fees, perhaps it may be worth it to provide an alternate means of payment, even if it is higher in some countries. You can see any "fish" that get caught in this "net" as bonus as you don't need a Fisherdwarf to man it. As for you not having heard of it, maybe it is more popular in europe? I can't bear any official/legal guarantees, but all I can say that it has been around for quite a while. I used it ard 4 years back for a period of a year, until I quit that online game, with no apparent problems.. (figured that if the online game host did not get the money, my game account would be frozen already). If you are worried about banking account, why not open a new one (1-way account where you take money out and don't ever put in any yourself) just for donations?
Of course, the setup would be a little different as Bay12 is under donation scheme while the above methods are epurchases with register key and whatevereverever. I would suggest that you set up a few standard donation amounts, maybe USD10, 20, 50, 100. anything higher can afford to send check.