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TTC and MM are fundamently the same, but from a different angle. TTC is based on a broader base of guilds, and just on postings, MM is based only on your guilds you have and the the actual sale price.
To my knowledge not addon has supported your method. I would assume MM may not be as accurate because it has a much smaller data set, TTC has a broader base and could have a better chance of using that methodology.
As to why no one is, I have no idea.
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