Bass, While I agree with the idea of "Best for the job is the one who does the best job" ...

I assume there is a Purist intent behind the request.

I hate doing this as the example because it makes me feel more like a pig in the eyes of some, but...

Example: A womYn site openly designed by a man will not gain respect if it is publicly stated. Whereas a Womyn site designed by a woman will. It's empowering and puts out a message of its own.

This may not be the very reason for the Gay only request but, you can use the same example for some gay men. Any and all support for gay only anything.

But I do agree, The job should be filled by the person (male, female, black, white, gay, straight or pan) who can do the job right.