Though they had the means, my parents never bought me a car, because they wanted me to work for it. I worked several part-time jobs in high school, scratched and saved almost every penny, and bought a 9-year old Toyota Camry my senior year.
Sorry, but if you've prioritized buying a BMW over moving out of your parents' house, you've got some odd priorities. Even if you pick up a chick in the Bimmer, good luck explaining your living situation to her without turning her off.
I suppose it's the suburban version of "hood rich".