Thank you for the reply. I was hoping that there were some others on here who are interested in this too.
I have also found that the prices for BDSM are often higher, and I don't think they should be.
Sometimes the "dominatrix" woman claims that she has the extra expense of a "dungeon" and equipment. I myself do not require a "dungeon" or any special equipment although I can understand that many of their clients would. I have come across a few who advertise that they only use domestic settings, and also that they prefer to wear normal outfits, and those are the ones most to my liking. One of those however does have a very high price - I met her once a number of years ago, I think her prices have gone up since then.
There is a lot of skill involved in this too - I guess there is in both types of provider, and so hopefully ukp could honestly help us sort the better ones from the worse ones. With regards my favourite activity - kicking - there are surprisingly very few that can really deliver a good kick to the balls. It's far more about accuracy than power, and it's important that the legs do not shield the blow.
With what you say about there being fewer who offer it, there are also far fewer of us who want to receive it, so I guess on a supply and demand level, they need to balance. Those who do like to really feel "set" in what they do.
I once suggested on a forum that they could offer "taster" quickies. Very short sessions that would offer activities like caning or kicking in the balls. Enough to inflict some decent pain, and affordable enough for those who are curious. My idea got thrown back as them not liking the idea of a "conveyor belt" - i.e. lots of different people popping in and out. However I could foresee a fair amount of business that way and making a decent about of money to help support their business model, and it may hook people into longer sessions later.