Has anybody ever rewarded a professional service provider with first class trips after they became your very good friend by doing something for you for free?

One of my frivolous desires is to have preternaturally white teeth, but it is far too silly to invest $20,000.00. On the other hand, if some cosmetic dentist who wanted to become my friend performed this service for free, just to make me happy in my old age, I would probably love them forever and gift them and their SO with a 1st class trip to Europe. Does this seem reasonable?

Has anyone done anything like this.