The comic book industry is also a dying industry and they are willing to add in any story to make their material sell. While I don't care either way about green Lantern being gay or not I still rather not have anything to do with the super hero's personal sexual preference while I'm reading.
The Green Lantern is among my most favorite of superheroes, especially Kyle Rayner, though in many ways this is in part perhaps because of how their power is limited only by their strength of will and their imagination.