There are always new highs on auctions of cult items. But that doesn't mean they all will sell for that much. Bidding wars and rich collectors sometimes make a sale double what the "going rate" is. But I agree with Keystonearms, with this additional thought; What goes up, must come down. Whenever I hear "the price will keep going up every few months! Better buy now! Before it's too late! Hurry, hurry, hurry, Etc.," I think of all the bubbles that have burst.
Like collectible muscle cars, that were at a peak about 10 years ago. If you bought a bunch of Corvettes or Mustangs at the top, you are now looking at losing a LOT of money. Same with stocks sometimes, or the real estate bubble, or gold or many, many others I've watched in my lifetime. When people start heavy breathing and saying things like "the price will always go up", I KNOW to stay out. If someone bought a safe full of Pythons and Diamondbacks the past couple years, he may be in a world of hurt in 10 years. Eventually the fad will change, the laws will change, the economy will change....and you might be trying to sell them for 1/3 what you paid. The greedy get burned, often.