Valve Corporation is implementing a big change concerning game bundles. Under the new policy, you will only pay for the games that you do not already own. For now, however, only certain bundles will be affected.
There's a big shake-up coming to how Steam's bundle purchases work, giving them dynamic pricing. In official documentation given to developers and received by PCGN, Valve have outlined a redesign of Steam bundles so that they automatically give buyers that already own some of the products within a discount. This scales based on the number of products, and is already available on some bundles in the wild, though remains officially unannounced. This also has the knock-on effect of making sure that bundles are properly discounted when their components are on timed sales.
Valve's official explanation to developers goes like this, "With Steam Bundles, if a customer already [owns] some items in the Bundle, they will pay for and receive only the items not already in their account. This allows the best fans of your series or franchise to 'complete the set' and get a deal on the remaining items in the Bundle."
Source: PCGames N
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