Really depends on the error type and denomination. It has been a loooooong time since I saw one of these for Ikes. Well over a year on eBay and reputable error dealer sites.
I think.... And I am speaking as an old guy here.... I believe the future of numismatics will be you guys that are on the leading edge of errors. Wasn’t all that long ago we would all ooh and ahh over the auction price of a 16-D Merc or an 09-S, VDB cent. These days you can pick those up in most any dealers shop. Errors are the hot ticket going forward. Wish I would have recognized that all those years ago.
Ahhhh. I gotcha. It's funny. If you look at auctions on Heritage, major errors are really shooting up the last few years. You are right about that.