As far as those "drive and go" Chevy's are concerned... Have you ever visited a Chevrolet forum? They aren't THAT reliable. My grandfather has an '06 Impala SS that uses 1 qt of oil every 1k miles. My 153k mile M52TU doesn't burn a drop. He also has many other issues with that car and it only has 48k miles.
You got to pay to play and just because you buy a $6k BMW doesn't mean it will be cheap to maintain. That goes for any luxury car. Mercedes, Audi, Cadillac, Lexus, etc.