Yes years ago AF 15 "WAS" a big book and will always be be huge book past present and future and for collectors no matter what age they are. As the book skyrockets your forgetting a major factor,collectors do have huge wallets. Why are people paying over 14k today for a 2.5 AF 15 when they could have payed 3k in 2011??? Well it's because there's a a lot of deep pocket collectors in this world more so then anyone is admitting to recognise. All I'm hearing is "who's going to pay 40-50k for a AF 15 2.0 say 10yrs down the road"... Well why is someone paying 3.1 million for a Action 1 9.0 Cgc copy in 2015. It's because someone can. You can't judge your own financial position to someone else's who is willing to spend big money on AF 15 or a whatever book they want,its irrelevant when some people have major money to spend.. Is there a ceiling to comics? No,,,,because if that's the case then no one would be buying big key books thinking one day it's gonna stagnate or plummet or worse not sell because someome is predicting the prices will be too high for some collector that won't have the funds to spend for there book..