I am not a collector myself, but my grandfather was a "stamp collector". I heard all through my childhood about the stamps he had collected since the 1950's, how big and presumably valuable his collection was. He passed almost 20 years ago, and when we finally went through his (admittedly large) collection about 5 years ago, we discovered that everything he collected was the type of stamp you describe - made to be "collectible", not actually particularly interesting or rare. Essentially worthless in terms of monetary value.

However, he enjoyed his lifelong hobby, so, who can say?