Quote:
... I would think that a commercially used solo usage would be much scarcer and more valuable than it's Philatelic counter part ...
Ideologically committed to GPU (Genuinely Postally Used) as I am, your plea has reached sympathetic ears.
One thing that works in favor of FDCs & FFCs is that they have an 'ideal' to work towards. Just as everyone can agree on what a MNHOG stamp looks like, everyone can agree on what a pristine FDC or FFC looks like.
That grants them a certain, uh, cachet; whereas every commercial cover is a little bit different - and there is no one single ideal commercial cover - the ability to narrowly define the pristine FDC or FFC means that it will also be easier to find a market for some day.
It is the same difference as trying to sell 5,000 bushels of #2 Yellow corn or trying to sell the equivalent standardized CME corn futures contract; the latter is the more liquid investment, except in the case of an actual zombie invasion.
How's this: it is the difference between owning 'a' commercial cover and 'the' FDC.
Cheers,
/s/ ikeyPikey