I think that we in the tech industry are... different here. In other industries, there is a /lot/ of pressure to look the part (well, to look an /expensive/ part.) Have you ever seen a real-estate agent in a car worth less than thirty grand? Hell, I've met a few sales folks and managers who wear watches they claim are worth at least half that.
Engineering is a little different in that we can dress down, and nobody is going to seriously give us shit for driving a piece of junk car. One can reasonably be a six-figure computer nerd and be a frugal person. A six figure salesman would be... well, he would be breaking a lot of expectations if he lived frugally.