Mike, Chris Taub (the bald haired short doctor) used to be a plastic surgeon and make tons of money, when he switched to general medicine and work for House, he makes a fraction of what he once made. he said he needed to talk to his wife, to come clean and tell her that they needed to cut back on spending because he was going poor very fast (his wife didn't know he makes alot less money). His wife is a shopoholic. Hence why he needed to talk to her, because of his switch to general medicine they could no longer afford luxery sports cars (like the one his wife was saving for).