I've been a collector of various kinds of things since I was a kid, and I've seen this kind of thing again and again. And I'm not just talking about the amount of stuff being made that is targeted at the collector's market. The same comments I see where people are lamenting their area of collecting getting overrun.
Just keep in mind that there are cycles to collectables, and people will eventually get out. If you are willing to wait, you will have the luxury of being able to get all of the items you want for pennies on the dollar when people are no longer interested. During an emotional crisis that was most likely due to the death of my mom, I began collecting Hot Wheels at such a pace that at one point I was able to sell enough of my collection to take 18 months off work. I still have literally thousands of these cluttering up my house, many that were once worth $50-$100 each, that I'll be lucky to get more than a few bucks for - most will go to charities and children of friends.
In my view, the best thing you can do is to welcome us "carpetbaggers" and wait for us to sell off the pristine sealed decks of the cards you don't feel like buying now.