Thought about it . . . and no, none of those interest me. In fact, most of that is disgusting, and I try not to think about each of those ideas for too long. BUT, I find as I go through my list, I keep adding things I wasn't into (mostly as an add on or BONUS to my main reason for booking). Maybe when I get older I'll get so bored that some of that will sound more interesting. I say that as someone who has consumed a great deal of porn for a long long time, and I still find most of that unappealing; but after reading about the cheese snorting guy on this board . . . well fuck it, different strokes!
I think fetish is vague, you need to be more specific.
The cuckhold thing is . . . disturbing. I would suggest not crossing your brands. I would not be interested in "normal" providers from an agency that dealt in that kind of alternative. Better to do each as a separate venture. I say that to mean, as a customer that would give me enough pause (and it doesn't take much) that if I were interested in a particular model, I would just put her at the bottom of my list of opportunities. And I don't mean that to say, because I judge that as outside my comfort zone it shouldn't be offered as a service - I'm grateful all the time that there are ladies out there that can be paid to fulfill my deviant fantasies, so it would be a bummer if other pervs out there couldn't find there thing too (let's all be happy); but I would be happier keeping the alternative ... alternative, in a separate agency. Just my thought.
A second thought about mixing up the genres. If you put some of these harder more involved services out there, then I would think the standard provider routine would not mix well. For example, an agency building a reputation for kink, where the providers have elaborate toys and skills, would not mix well with the YMMV type of women that make up 98-99% of the hobby. Not sure that would mix well. I think consistency would be in higher demand for that type of agency