How odd. We have a couple of vehicles that we drive all the time. We used to have a jeep that went very well in the snow and usually drove that one exclusively in the winter. I do hope he starts them both in the off season to make sure they are still in good working order.
I don't think it's odd at all. I know a lot of people who only drive their cars in certain seasons. Here in the north east it gets pretty snowy. If you have a nice car you might want to put it in the garage for the winter.