re: Do you reflexively think luxury car = rich driver and old car = poor driver?

No. Generally speaking people that drive VERY expensive cars as in $100k up are not overly wealthy (as in net worth) they make good money yearly. Usually they are in the $2 mil to $10 mil net worth category. Most of the people I know that have a net worth over $8-10 mil or so have one or two nice cars but also have one or two beaters like an older F150. Rarely do they drive a car over $80,000.

Now the docs and execs that are making $500k-$1mil yeah they tend to be the ones that have a wife driving a Gwagon or 8 series to show off.