valuation of miles and points

As with any currency, the true value of various miles and points is determined by their trade value on a unified, liquid, and open market. Unfortunately such a market does not exist publicly — there is an underground secondary market with sometimes stale prices, minimum trade requirements, and counterparty risks, but generally speaking there is no notion of transparent prices. So you often see “Mileage Blogger” sites like this bandying about valuations pulled out of thin air. There should be a much more principled way to determine valuation that helps to make transaction decisions easier.
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