Nah, no lesbian clients. I've definitely bought into my share of SM shows and tipped into MFC shows*, so I think lady-clients are out there, but I think we are relatively discreet if we have any sense of propriety. I rarely make it known that I am female unless it is a model I know and I am just popping in to socialize. Even then, it is in a ninja-tip note. I think that if someone is making a big deal about being a lady, they either a.) aren't a lady, b.) are looking for free attention/stealing clients, or c.) both.
On my personal end, I get a TON of sissies doing their thing, which often involves pretending to be female. I really adore my sissies and have a few longterm clients, so as long as they are willing to pay I have no issue with it. Still different, because most of them still seem to identify as male outside of fetish play, but I wanted to chime in in their support as they aren't a demographic you want to miss out on if you enjoy that fetish. That said, I think most of the ladies on here are savvy enough to differentiate between a sissy wanting a show and a dude posing as a chick just to waste your time.
*I am bisexual and have had serious relationships with both women and men, so while I am not strictly lesbian, I definitely enjoy the ladies.