This was in a MarketWatch article on the Gamestop bubble but it applies with equal force to anyone investing in sports cards and looking for a top:

“The problem is when these people are sitting on a mountain of profits, rather than thank their lucky stars and lock-in these once-in-a-lifetime profits, they are too busy gloating and taunting the other side. Instead of being satisfied with nearly $500, bulls insist on waiting until this goes all the way to $1,000. And bears that captured a 77% tumble in 120-minutes, rather than jump on this historic move, they demanded it to go all the way to $5. And you know what, both sides are equally guilty of holding too long and letting these historic profits evaporated before their very eyes. As the saying goes, ‘Bulls make money, bears make money, and pigs get slaughtered.’ Don’t be a pig and take these spectacular profits when you have them. Because if you don’t, they will almost certainly be gone in a few hours.”

Vegas Dave will collapse in the next 24-36 months

So, you taking the over or under?

As other assets like stocks, it’s normal and healthy to consolidate after a boom.

But to predict a bust just because it ran up doesn’t factor the possibility i) there may be a consolidation period to digest the run up and ii) asset prices generally rise over the long run through the cycles- which cards have exhibited several times as we long time collectors experienced.

His name is Vegas Dave for a reason I guess...

IMO, every asset class is in a bubble due to the central bank liquidity. Given fed messaging for QE support for the next several years, add fiscal stimulus, they effectively removed cyclicality in the economy - so we may hit bumps but I take the over...

My prediction is prices in the next 24-36 months will go up, go down, or stay the same.

You might be right. I can't decide...