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Store prices have nothing to do with a game's value. (Almost always)
Once a game goes in a bundle or giveaway or large sale its value drops considerably based on its supply and demand and availability + last date of when the game was on sale or bundled.
For a good place to see all this info you might want to look into Enhanced Steam Plugin.
More knowledge = less chance for you to get scammed.
Cheers.
Batman™: Arkham City GOTY Edition
Final Fantasy XIII
Games prices are equivalent, so lets trade!
Mine is key.