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I assume these prices have no adjustment for inflation?
None what so ever in that table.
For me, I have an excellent used set that gets better by the day. I purchased it with mint, face value postage even paying the sales tax with face postage. The postage value dropped far, far more than the value of the three stamps in the same time period.
One must remember, if you were lucky enough to pick up the Columbians, Trans-Mississippians, or Zeppelins from the PO at face, you would be dead now.