See, there's where you go wrong. Morality has no bearing on sexual orientation. There is no right or wrong to being gay or straight. Just like there's no right or wrong to being black or white.
Heterosexuality is in the interest of the state? Who says? I'd argue that a gay couple would be more productive than a straight couple, as the gay couple aren't worrying about having/raising kids. Again though, moot point, you have no evidence to support this
Produce the next generation of citizens? Let them adopt, problem solved
It seems inconsistent to say that accumulation of wealth is good for the person not the economy when arguing against gay rights but when the subject is switched to the free market and economic inequality, the accumulation of wealth is your God given right... hmm.. Also, I spend very little money on children, as a single guy, are you going to argue that I shouldn't have the same rights as more economically friendly, child supporting straight couples, and use my lack of funds towards kids as a justification, too?
There is no such thing as "the norm" when it comes to sexual orientation, as supported by the multitudes of variables of sexuality people are into, 3 somes, 4 somes, DP, swingers, polygamists, gay couples, people who like transexuals, people who like midgets, and on and on and on into infinity. If you think human sexuality comes with a "normal" stamped to it, you haven't fucked enough
You're in no position to determine who is of how much value to anything except yourself