>>6796503With most games, even the really good ones, you're better off waiting until about 4-6 weeks after their initial release, because there are a lot of people in the world who literally spend all of their spare time playing video games, so they're always seeking new games, playing all the way through them, selling the game, buying new ones and repeating that.
When they sell the game for a quarter of what they initially paid for it, that's when you buy it. And it probably won't take long for those people to complete the game and sell it online. Just keep your eye on the market.