I totally agree with the proposition on value appreciation on watches v depreciation for cars. For me, if PP depreciates like normal cars, I will not think about it. Some cars like limited addition Ferrari or some other antiques do appreciate, then it makes sense to invest in them. Buying certain good models PP is the same as in investing into antiques, art pieces, seeing the value appreciating is part of the fun......
Of course, if you are one of the lucky guys who spend a few hundred K on a car just like me spending a few bugs on a coffee or any other consumables, then it is a different league.
Regards