We have two. I worked when we were married, and my husband has always sold cars. That means not only do we get a good deal, but he works 12 hour days. And with two children, I'm not driving out at 9pm at night to pick him up at work.
I do however try to plan my trips to be more efficient, and get more done in one outing.
My neighbors, however, have a flippin car lot in their driveway, the road in front of the house, the road in front of the neighbors house.