When everybody else is buying, you ought to be selling. So the old stock trader maxim has it.
Through sheer weight of market forces, prices of Hulk #181 went crazy this year. CGC 3.0s were trading for the price that 6.0s sold for a year ago.
Stan Lee's death gave this book one last artificial bump, but the bottom has already begun to drop out of this overheated issue.
If you're still holding it... Or worse yet, still thinking of buying one...
It's time to let go, invest the money elsewhere, perhaps even lick your wounds if you bought high and are having to sell a bit lower.
Wait until you see what else you could get for the same money.