Yebbutt Geoff, it would take a lot of drink and fags to equal the warp drive depreciation that new cars are subject to.
Take a £42k when new 2015 Merc C200 estate that my brother in law has just bought for £15k from a Merc Dealer. 25,000 miles on the clock.
£27000 depreciation in just six years - you do the maths as they say.