If the GOP were not so fundamentalist and homophobic, I am sure they could attract a lot of gays to their tax policies: remember, gays tend not to have access to the sort of tax breaks and deferments that families get, and because they do not have their careers sidelined by raising kids, they have a lot more disposable and taxable income.
But only a myopic and self-loathing gay would have anything to do with the modern GOP