would it work if you expanded your target market from just users and fans to the wider public, maybe advertising online, word of mouth (fashionable friends may see you wearing a good t-shirt and ask where you get them)? you could even make another website for elements where you can order your product. i understand that there may be difficulties in advertising and also with retail and manufacture where, if there aren't enough orders or the idea doesn't even get up off the ground it'll be a waste of money, if there are too many orders you may reach the limit of imported goods that the supplier allows, if you get the price even slightly wrong you wont get enough profit (if any) and alternatively no one will want to pay such a sum as given, and again money will be lost. publicity would also be an issue as it doesn't actually sound as if there's enough money going round to produce sufficient advertising.
there are probably many more minor and major difficulties, but if we find a way to get past them, would it be possible? cos that way it would be entirely separate from the donations and thus will not reduce the amount of people donating. i've always thought business could be made out of this ever expanding game.
btw, if this thing really works would we elect treasurers like we have card curators and deck helpers etc...