I have the privilege to be granted and served a number of mistresses over the years.
The more obvious ones were: Mistress Minky, Mistress Kitty, Mistress Sayako, Mistress Anya, Mistress Hibiki, Mistress Nurie and the latest being Mistress Domina Fire. There were more but due to old age

, I cannot recall as much now.
I think this whole thing is very subjective. Varies from person to person and the chemistry between the mistress and the sub.
I remembered some of us wrote here that they find certain mistresses not suitable for them but there were ones who enjoyed their time with these same mistresses. So there is no right or wrong.
As to the dollar value, I think most important is how one enjoyed his time or session with the particular Mistress. You can part with just S$50 and not enjoyed a moment with that particular mistress. However, you may part with S$500 and enjoy every single second with another mistress.
At the end, no right or wrong la. So bro Dr Sex and Dr BnY, chill it la. I have read and enjoyed both your FRs. Let's bury and end this whole thing and contribute more positively toward our encounters with the various mistresses.