I work a lot and do all the usual good practices with money. Plus I'm very lucky to start at a big and expensive organization. I also help them out in other areas (tech help, clean ups, shopping etc)
I'm not amazing to look at but easily far above average. Plus a modest boob job helps.
I don't fill a certain niche but I'm willing to do a lot beyond just sex. For example any gf/wife experience with me includes managing the clients houses, dealing with repairs and really a lot of non sex stuff. I help with sexual and non sexual frustrations.
A great client is a client that know what they want or is at least willing to talk and figure out what they want. The clearer they are the better it'll be for us both.