How should I know?!?!?!
I'd say look at the amount of games you have, maybe divide it between new and used. For the new ones multiply by the standard sell price in your country at the time it was new. For used estimate what the possible sell price when you bought and tally for a rough estimate. While I've been happy with most of my purchases (shakes fist at dreadlock bionic commando game) I seriously spent alot of money on games through the years.
Every game ever, including systems, controllers, and other accessories?
Do the games that other people (i.e. my parents, my brother, etc.) count?
If you total up the amount of money spent on games, systems, and accessories for me, then probably, as long as we're talking about a reasonable car and not something insane.
If you're talking only about money that I've spent, myself, on games for me, then probably not. Not on a reasonably decent car, anyway - maybe four wheels and an engine, but not something decent.
Considering you can get a bare-bones care for roughly $20,000 (CAD) and games cost $60, then it would take a little over 300 games to accomplish this goal. That figure might be a little unobtainable for most (including me) as it would require to buy multiple video games a month over a period of multiple years. However, if you factor in the cost of consoles, accessories, and Steam, then that number becomes a lot more realistic. I've owned an NES, SNES, N64, GC, Wii, PS2, PS3, Xbox, Xbox 360, and Dreamcast which were probably roughly $300-500 at time of purchase. Now add all the handheld consoles (PSP, Gameboy Pocket, Gameboy Colour, Gameboy Advanced, Gameboy SP, DS, 3DS) and the games and accessories for that and that $20,000 figure is probably a low ball. While I did not actually purchase the bulk of those consoles (my parents did), I would guess that any person ~20 years old who has been gaming essentially the whole life (and has kept current with the hobby and not bought everything way after the fact) could have probably bought a car with that money.
The wonder is: think of all those video games I could have bought if I didn't own a car.
I'd say that on average I have spent, or had spent on me, $1200 a year in video game related stuff (this includes PC components and whatnot). I've been into games since I was 12, so that makes 12000$. I could, in fact, buy a Kia. I think I've made the right call so far.
Eh, maybe, maybe not. Actually, come to think of it... I've been playing games for around fifteen years, so almost certainly yes.
Still, y'know, had enough left over to buy a secondhand car. It's great. Blue, French, and comes as standard with 59 blue-cheese loving horsepower.