Just enough strippers in the inventory, so they always have one they can post a cheap price in their ads. Those are the ads with the vehicle stock number right under the price.
I always justified the bells and whistles I wanted, by saying well, when you figure the total cost with financing over the period of the loan, it's worth it.
If I still wasn't convinced (I can be difficult sometimes
) I'd add the cost of insurance and maintenance in too.