Very true, but we are dealing with fixed rates here rather than variable so peoples monthly car payments aren't going to change until it's time to start a new deal. At which point they should walk away and buy something more affordable.
True, but while the car payments are fixed, and manageable at the time of taking the PCP deal out, interest rates, and economic fluctuations can effect other aspects of your life. Mortgage rate rises, fuel rises, food price rises. All affecting that (once) affordable monthly expense.
Suddenly you have a choice to make. Mortgage and food, or keep the car that should be out of your wage structure anyway. And if you are in negative equity, you suddenly have to find potentially Thousands of pounds to get yourself out of it. And if you can't, then you run the risk of defaulting on your mortgage.
But hey, put the back seats down, and it can be a bed for the night !