If "used games" includes "rented games" then yes, that would stop me from buying it. I've rented hundreds of games over the life on my 360, and only purchased a few dozen. If the PS4 lets me rent games and the new Xbox doesn't, I know what I'll be buying, no matter the price difference between them. If neither of them let me rent games, well I'll just use that money I've put aside for them and upgrade my computer a bit further, and earlier then I had planned.
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