I think you hit the nail on the head with regards to the intent of my question. What about San Diego did you find expensive? Just the overall lifestyle or the cost of tennis there is higher than elsewhere.I read the subtext of the question as "where would I want to move for great day-to-day tennis", and for me being prohibitively expensive kind of rules out San Diego as a serious choice.
If OK wrong about this, then I nominate ... Monaco .
I mean, just look at how many touring pros live there .
That being said, I wouldn't mind being in Monaco and hitting at the MCCC.