The thing with Mystic that has mystified me lately is how, with all of their overhead, they stay in business given that their main product, stamps, are tied to catalog values that have not moved with economic conditions (inflation). They have a 50,000 square foot facility and up to 150 employees at times. RE taxes go up, wages increase, utilities and insurance climb, printing costs are through the roof and so on. And yet if you look at their prices over 5 years they are the same. It is a volume business but I cannot say that I can name a collector that uses them on a constant basis to fill their needs.
I sense that Mystic caters to collectors who are essentially "outside" of the organized collector universe. As such, it is hard to quantify how many of them that there are. If Mystic is doing well still, then that could be a good sign for the hobby. Maybe there are more individual collectors out there than we know.