I would say that Gates McFadden felt it was beneath her, hence not using her real name, which is Cheryl Gates McFadden.
Well, I would imagine attending Sci-fi conventions and participating in Star Trek documentaries would be even more beneath them, but I suspect they realize how much money is in it for them. I think Star Trek: The Next Generation is all Denise Crosby and Gates McFadden are known for.
So if they still disdain Star Trek, they are pretty much prostituting themselves by making a living going to these conventions and appearing in these documentaries.
Or they’re still using Star Trek, hoping to get something better, a big break more suitable for someone of their high acting pedigree.