The main gay-marriage arguments promote childlessness, something "marriage" per-se has never been about.
I propose allowing any, again, ANY child-rearing couple to marry, and banning any and all childless couples regardless of their composition. I would even support incest for this reason.
I wanted to make a family. As you can tell from my argument, I have no intention of stopping anyone else from making a family.
If gay-marriage is going to be about sweeping existing problems under the rug in the name of identity-politics and feel-good legislation, then I'll oppose legalizing gay-marriage even-though I would like to see child-rearing gays wed.
From my perspective, the current gay-marriage arguments and rationals harm me directly because they perpetuate if not exacerbate the divorce rate and related juvenile crime/abortion/teen-pregnancy rate, which in turn harm the economy.