They won't buy them when they're $400 new, but when they are $150-200 (and still consume the same amount of power), they very well may. In this situation, the PSU would then have to be upgraded as well.
Actually, most people don't play computer games, and therefore have no need for anything above onboard video (or the card that came with the computer.) My experience here is that anything over $150 is too much for a video card, and by the time the $600 (Cdn) card gets to that point, they are buying a new computer anyway.
The difference between an Antec True330 (which is the absolute bare minimum I would ever put in any computer, period) and an Antec True430 is $10. To go to 480 watts is just another $10. That doesn't seem like too much to ask--plus the supply will be less stressed and run cooler during operation.
I use AOpen 350W PS's here. I'd love to move everyone up to 450W power supplies, but my cost would increase by about $100 to do so, so it's not an option. In your case, I'd do it in a second. The marketing value alone would be worth it.
T
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