They're usually the most insufferable people I've ever encountered... and oddly enough, from my experiences, they typically aren't rich.
It takes extreme self-confidence to find yourself at odds with 75% of gays and 75% of your party, thinking the former are deluded and part of the herd and the latter are fools whose bigotry is being used to serve your cause. You don't have to be arrogant to be a gay Republican, but for many, it really helps. They find themselves on the defensive all the time so the wall comes up.
Yes. As a gay man, I tend to sense that they use their homosexuality as a bludgeon to distance themselves from others (to stand out, oddly a separatist/not conservative position), and because of this desire to stand out,
to be different, they have to embrace conservative positions for the attention. Now obviously, not all gay Republicans are just Republicans for the sake of being different, but there's a very particular strain of gay conservative that is like this, and I (and all my gay friends) despise them. They are awful, awful people. They need to grow up.