Next time you're at a show take note of what age group is doing the buying. There are exceptions like Wes, Tara, and Aaron, and even several guys in their 30's, but the majority of pertoliana collectors are in the 40-65 range. I think prices will remain strong for a number of years, and the really high end stuff will continue to command strong prices for a very long time. But the low to mid range stuff will decline in value as aging collectors sell out.
There are a number of reasons why younger people aren't involved in the hobby. Some have been mentioned already. The escalating prices that have caused many to view their collections as investments can actually price the younger folks right out of the hobby!
Wanted: Gas pump globes:Sinclair & affiliates, IL companies. Ripple bodies. Anything Sinclair, Stoll, Pierce, 4 Bros.
http://www.lastgas15.com/