These aren't the few that are loss leaders. But also a BMW 3 series costs less than my minivan, so I would hardly call that a luxury vehicle. Of course you can get a high end BMW, but somehow I doubt they would be very profitable without the lower end of the market. And that's the point for Tesla as well. By introducing a car that starts around the same price as a 3 series BMW, and selling in similarly high volumes, they can also be extremely profitable.