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If steam is included, 12b is a joke, if just valves game rights, meaning HL and CS, then the price is not THAT stupid (still quite).
Maybe this would be the way go get HL3, it would ofc be horrible cashgrab, but HL3 would be out.
Edit: bit details, in 2021 Valve had $10b revenue from steam, and $3b revenue from other sources (heh, source, get it)