Another financial aspect to consider is that the Dems are quietly advancing the rollback of the marriage penalty. Patty Murray introduced just such a bill in the Senate Budget Committe last Spring.
Gays tend to be more affluent and financially savvy than the general population. That the Dems are suddenly starting to take shots at a big disincentive to marry speaks volumes.
All the gay people I know spend like drunken sailors. That’s why so much advertising is pushed at them.