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I would disagree with that. Holding a patent with a large enough claim can yield dividends without actually creating or proving anything. Eventually, ideas outside of industries you never even thought of now violate your patent and you have grounds for legal action.
On every patent, there is a listed inventor. Buying someone else's patent does not change the listed inventor. US Patents have their problems, but AFAICT there is no better metric for inventiveness in a person than that. Perhaps novel businesses started is second best.
