As a minor historical note, the focus on gay marriage rather than other aspects of gay rights started out as a minority position, not a privileged one. Or so I gather from reading Andrew Sullivan, who seems to have been pushing for the emphasis on marriage rights at a time when that was still controversial among LGBT activists.

ETA: I find the downvote bizarre. I assume it's for PITMK reasons, but I'm not presenting a normative stance one way or the other.