sdr-
I may be wrong, but I’d be willing to bet that the demographic you are speaking of, the one that earns $125k-$200k per year or more, is in the minority. This figure seems to be well above the median income ($52,192 per household SD County in 2005 adjusted for inflation – SANDAG) of the North County Coastal area, and many of the surrounding areas.
Maybe you have some concrete data that shows what percent of households make this much, but I would bet it is not that high. I estimate that the majority of household incomes in SoCal are well below your figure and perhaps many of these households are living off credit, which is the new second job these days. Either that or they took advantage of the stated income aspect of the loan process that was so prevalent in the past few years. Is this where you got your figures from?