Good question.

I doubt most long lasting Dommes would specialize based on the location over their own interests. Advertising something they didn't enjoy would probably give them really bad burn out. Do some Dommes do activities that aren't their top favorites? Sure, but they wouldn't specialize in them or advertise them heavily in my opinion.

Golden showers are highly requested in my area, but I still won't do them. I can confidently say I'd see at least a 15% increase in income if I offered/advertised them, but it's just not worth it to me.