I know this is the "misstress" section but I wanted to contribute anyway because it's a good thread.
Personally, I don't see the fun/neccessity of controlling every little detail of a sub's life. Then again, I'm not one of those subs who cowers in the corner and accepts having no input. And when I Dom I expect the same. I like women who have opinions. Ideas. Why take that away? Granted, if I have a command ("Wear the blue dress. I like it.") I expect it to be followed but I'm not going to micromanage someone's entire existance for them.
And don't get me started on "finincial domination". Greatest scam since the invention of the interest rate.
In terms of calling someone else "Master" - in an online setting I'd accept it. In person, no. If they were bisexual and felt the need to also explore with a Mistress, I would be more understanding, because no matter what I do as a Master there would be certain things I simply couldn't fulfill for that person. If they also said they needed vanilla in their life, I'd hope we could accomodate that together (I likve a scoop of vanilla once in a while too) but if not I'd allow them the freedom to do what they needed.
If they worked in the sex industry and were getting laid by a new partner every week for a living, I'd never be with them in the first place.