As announced by pcgamesN Steam are set to change the pricing of game bundles depending on whether the user already owns any of the included games.
“Past Complete Packs were sometimes a bad deal for customers that already [owned] one or more of the products in the pack. Either it made bad economic sense for those customers to purchase the pack, or they just felt bad about doing so since it [looked] like they were paying for products they already [had]. The new Steam Bundles system addresses this.”
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