True, gay people can enter into heterosexual marriages. As for the subsidy, I doubt that will change unless the affected group decides it has become too onerous and starts putting pressure on their representatives to remove it. Which means that more people getting married could shed more light on how unfair the system is for single people. It shouldn't have to be this way but unfortunately that seems to be how it goes.

That's a very cynical point of view based on seriously flawed premise i.e. that the biggest reason people get married is to obtain some financial benefit.

People mary because they are in love and they want to assert that loving relationship in the society and with government. What comes with that is a rich array of benefits and obligations. Most of the benefits (like the right to vist your spouse in the hospital) only have value if you actually care about your spouse.

So yes, technically gays can do fraudulent, non-gay marriage with a random person, but don't use it as an argument for discrimination by denying the marriage with people you actually want to marry (for a host of reasons that have nothing to do with the financial windfall you claim to exist).

Also, if there really is such a financial benefit to getting married, how come we don't have an epidemic of fake marriages? Your basic claim of financial benefit to marriage is not supported by observable facts.