While I don't usually collect self-adhesives, I felt that the Priority Mail and PM Express stamps were going to continue to get more expensive as the years progressed, which means fewer collectors would buy them from the PO (think $1 - $5 Columbians), making M NH stamps scarce in the future and expensive to back-fill into a collection.

Therefore, I decided years ago to add a single and a plate block of each issue to my collection so that when it passes to my son or grandson, they won't have to pay those huge sums to back-fill the collection.
