Import V.S. Domestic

I made the decision to pursue employment with one of the import brands and on my quest I keep running into the same story which goes like this: $80 to $90 dollar door rate with a $60 to $70 effective rate and hours per ro always below 1.0! Even with imports being trouble free forever and only requiring scheduled maintenance what gives? I have an opportunity to go to a Nissan Store with a nice salary and what looks like a good % of the net but the owner admits that Service and Parts are showing a net loss for the year (haven't actually seen a statement yet or an account break down). Being a Chrysler Guy only since 1984 my mind is having a hard time understanding why these stores are in this shape. I love being paid off the net and I am alright taking my hit up front until I get the Store straightened out but am I missing something here?