I know charmax back in the day created some absolutely amazing Xena femslash vids. (Which reminds me - I need to check to make sure that my copy of "Boom Boom Bah" survived my most recent "transfer all files to a new computer" experience)
I'm not a vidder, so my $0.02 is probably worth more like $0.01, but my theory is that it's two things:
1) There are fewer vidders in general than there are writers/fanartists, so there are fewer vids overall.
and 2) F/f pairings can be harder to vid than most of the really popular m/m and m/f ones, because vidders are confined to working with actual canon footage most of the time, and many f/f pairings have less total screentime together than canon het pairings or than TV Show X's two intensely homoerotic male leads. It's possible to manipulate footage and edit shots together to make it look like characters are interacting when they're actually not, but that takes more time, effort, and technical skill than doing a pairing vid for a couple who have a lot of screentime gazing into one another's eyes and kissing and fighting off badguys back to back. It would be much easier to make a Tony/Pepper vid or Thor/Loki vid (for example) than a Natasha/Maria vid.
Anec-data: I've seen at least twice as many yuri AMVs over the years as I have live-action f/f vids, and most of those have been for characters that do have lots of onscreen interaction.
Re: femslash production
I'm not a vidder, so my $0.02 is probably worth more like $0.01, but my theory is that it's two things:
1) There are fewer vidders in general than there are writers/fanartists, so there are fewer vids overall.
and 2) F/f pairings can be harder to vid than most of the really popular m/m and m/f ones, because vidders are confined to working with actual canon footage most of the time, and many f/f pairings have less total screentime together than canon het pairings or than TV Show X's two intensely homoerotic male leads. It's possible to manipulate footage and edit shots together to make it look like characters are interacting when they're actually not, but that takes more time, effort, and technical skill than doing a pairing vid for a couple who have a lot of screentime gazing into one another's eyes and kissing and fighting off badguys back to back. It would be much easier to make a Tony/Pepper vid or Thor/Loki vid (for example) than a Natasha/Maria vid.
Anec-data: I've seen at least twice as many yuri AMVs over the years as I have live-action f/f vids, and most of those have been for characters that do have lots of onscreen interaction.