I like the design, though I don't particularly want one for myself. I would not be surprised if these shirts became quite popular with both FE'ers and RE'ers either to express their real views (FE'ers) or for humorous effect (RE'ers). I rather expect that the majority of those who wind up wearing them will actually be RE'ers (even if only because they so vastly outnumber FE'ers.
And I agree that there is nothing so terribly wrong with Daniel making a profit on selling them, or recouping some of the cost of mantaining this site. I do find this site somewhat entertaining (sometimes downright hilarious, in fact), and there is a certain amount of value in that. Besides, if this site inspires some people to think seriously about why they believe what they believe, rather than just unquestioningly accepting what they have learned by rote, that is not a bad thing, IMO.