Honestly chaps, look after your cars, but don't be afraid to use them, if you really don't want to loose money, don't sell them!
I reckon its the other way round. Write them off in the family accounts as soon as you buy them. Then anything you sell them for is a profit. Man maths.
Well its only like SWMBO saving 2k by buying a mink coat at a sale, isnt it?