A gay couple has a Darwinian advantage because two people work full time without the need to raise a child. So gays become CEOs often from the work ethic.
The CEO then mistakes their success with the public customer’s approval of their lifestyle. The public is instead revulsed by poor lifestyle choices, pushed on to the product.
Moral of the story.
DO NOT BUY GAY STOCKS!
Do not buy stocks with gay CEOs. It has a higher likelyhood of failure. Especially when a hetero company, of relative success, is taken over to become a homo company.
I know of no study because it would be censored.
Good observation.
If by "Darwinian," you mean "natural selection," then they have no advantage at all. While they might be able to have a financially successful career without the distractions of children, the fact that they don't have children means that their gene line is a dead end.
Natural selection refers only to success in reproduction. If you manage to birth and raise two or three children to adulthood and they are able to have children, you are successful. Nature cares about nothing except ensuring the next generation and the survival of the species. The only biological reason that anyone exists is to fulfil that imperative. And gays don't, so they are supremely unsuccessful in the only way that really matters.