US large paper money price guides


Lately I've been surfing large size us notes for sale on EBay and dealer inventories. I just looked at coin world paper money guide that was just updated on their website. I'm just amazed how low coin world's price guide is in comparison to EBay and dealers stocks! In most cases it isn't even close! Same with Banknote reporter. I'd be interested in hearing opinions why this has happened. 

Printed price guides may always lag current prices, but it seems that in in 2020 & 2021, the sales prices of many different collectibles have increased incredibly. Is it because people are home during the pandemic and getting interested in their collections again, or have speculative investors hit the market place? I don't know the answer, perhaps some dealers could answer that question.