Not sure if I can put a number on it really. I think I'd probably have to get one if they release a new Metroid for it.
What games make up most of that 500 hours? Console games tend to be pretty pricey compared to the deals I get on PC with Steam so I find it even harder to justify paying that much for a game that doesn't offer a lot of content for the asking price.
MK8, NintendoLand (was my only game for nearly a month), Super Mario 3d World, Madden, Sonic and All Stars Transformed, Zen Pinball, Star Wars Pinball..... I have like 30 retail and 30 eShop games. Got lots of them on sale for under $30 (some under $20).