There are economic benefits besides income tax breaks, the services and other legal rights for example.
Homosexuals simply don’t deserve marriage because they will not reproduce for civilized society.
You have to make define what you are talking about before there can be any profit in discuss thing this.
Are we talking about Federal policy? Marriage is outside the purview of the Federal government so it makes no sense to argue about it in that framework. That means it is irrelevant what a candidate for Federal office things about it (except that it’s none of the Federal Governments business).
Are we talking about state policy? We probably live in different states so it’s none of my business what the citizens of your state decide to do about this and vice-versa.
You want to talk about society in general? You and I probably agree completely on this. It is foolish in the extreme to redefine the parameters of a foundational institution.