Thank you for explaining better or rephrasing your question. Here are a few ideas/suggestions for you:
-I would give this client some free sessions when possible
-Maybe he/she could bring a friend of a family member every now and then for support and more fun
-If he/she has few friends who would be interested in trying out your services then there a couple of options you could consider: 1)Give your client free sessions for every client he/she refers you to and sign up, 2) Make him/her the ring leader if you can start boot camp classes and he/she brings you a number of clients that would be interested to sign up for and in return let him/het to train either for free or with a deep discount as long as he/she does the leg work and promotes your class and spreads the word.
Usually wealthy people like to socialize with other wealthy people and this can be a great benefit to you. I hope this helps.