>And in any case there is simply no real value for gays to become 'married' other than getting a sticker.

The "sticker" was a visa in my husband's case. Although the UK does not require you to be married to your partner in order for them to get a visa, you have to provide all kinds of ridiculous documentation in the absence of a marriage certificate. In other countries (e.g. the US), being married is an absolute requirement.

I don't know what culture you're from, but culture is people, and support for gay marriage has increased massively in countries around the world, and is probably the majority in western Europe and North and South America. If by culture you mean "how things have always been done" then that's saying that public opinion never changes, and that slavery should never have been abolished, women never given the vote etc. Times change, and happily my culture at least is far less homophobic, racist and sexist than it used to be even 30 years ago. There are sadly still areas that are still very homophobic (parts of eastern Europe, Middle East, Africa, the Caribbean, for example), but overall the momentum is in the right direction.

If you've acknowledged that marriage culturally is a sticker, why care about something so insignificant?

Legally, there is obvious value. Stating such an opinion leads me to believe you are being willfully dishonest in your argument.