Sorry, but just not seeing the negative regarding warning collectors about Dunes. We are always informing collectors, especially newbies, about bad sellers, fakes and counterfeits, deceitful practices of all kinds. Why was it bad to inform collectors that Dunes were not an "investment"? When they were first issued you paid full "face" value for Dunes but as time went on they could not be given away.
Yet, ironically - Dunes are now sought after, especially in Europe and the Middle East. MNH and overprints, errors, postally used on cover etc. bring decent prices. Anyone who was buying boxes of this stuff in the 80's to early 2000's for next to nothing is now sitting pretty indeed...