It makes sense that games would get so much cheaper over time, considering much more sophisticated manufactured goods have improved considerably while getting cheaper after inflation.
Cars have a higher development investment, as well as marginal costs per unit considerations. Adding a feature to a car, like a carbon fiber hood over a steel one, incurs an added unit cost, while adding a level or something to a game has almost no marginal cost increase.
> Lastly, the growth in the car market is roughly proportional with the increase in population, while the gaming industry has grown at double digits per year for decades now.
It's not like I'm getting five cheap 2008 Fiestas in a Humble Bundle any time soon :-P
EDIT: I stepped away for a moment and just noticed that you edited your answer. I'll keep my reply intact anyway.
Cars have a higher development investment, as well as marginal costs per unit considerations. Adding a feature to a car, like a carbon fiber hood over a steel one, incurs an added unit cost, while adding a level or something to a game has almost no marginal cost increase.