More specifically, this - I've paid so much I must get my money's worth - is not so much as wrong as too weak to support your policy. The costs are as I said earlier: buying the car, depreciation, a reduced proportion of maintenance, insurance and tax.
Depreciation is broadly invisible unless you're buying new, or in some ways, a car at the end of its life. Buying a car is a one off cost, and in my case, it's identified as buying me a capability that I wouldn't otherwise have. Now insurance (especially the baseline cost that won't reduce over time), tax and non-distance related maintenance are 'money's worth' factors to me. This is because they're not related to how much I use it, so faced with having to pay them, logically I should either sell the car or use it enough. I'm not selling the car because I'll lose the capability I paid for, so I'll use it more instead.
That's solvable by making the cost of motoring truly usage related such that each journey incurs a cost. Private ownership is not incompatible.