I wouldn't spend 6 hours polishing a lease but I would a car I owned.
I don't see the difference. They are just different ways of having the use of that car for the duration. Why does it matter whether you buy it brand new with all the pounds you've saved up and then sell it 4 years later or whether you lease it for 4 years? It's still the car you're driving for 4 years. It's still you that has to look at the swirl marks and paint damage - if that doesn't bother you because of the funding structure employed to buy the vehicle I don't see why it would suddenly bother if you've paid cash. You either want it to look really nice or you don't.
What about a Personal Contract Purchase? 'This one goes to the car wash because the finance company owns it until I make the optional final payment'.