There are two types of buyers right now:
1) People like me with a decent stash already.
2) Joe Schmo who has nothing and REALLY needs something.
I have a decent stock and will not pay $100 for a Pmag just to add it to the collection, so that items stays in stock and on the market for Joe Schmo who really wants one and is willing to pay. If no one raised their prices, then there would be NO supply, as jackashes like me would be buying them up just to add to the pile. Free market, supply and demand.