I assume that this business has some control over its inventory. For a small store, the best strategy would be to follow previews and release dates, then to just buy only the games that either look good or already have a huge following.
True, 80+% of games are crap, but about 30% of the crap can be weeded out just by reading the game's title. Even more can be weeded out by staying on top of previews and reviews.
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