SCOOBY-DOO: Going for big money on eBay!

I did a Scooby comic cover a long time ago with Daphne as a "Elvira, Mistress of the Dark" homage and it's going for big money on eBay! These are "raw" copies going for that price! Not even slabbed by CGC.

I sold the original artwork a long time ago to a Scooby collector. I got my normal asking price but wonder what that artwork would go for now? Hindsight sucks sometimes. Who knew?!

I have three mint copies of the comic bagged and boarded in my work archives. I wonder if I should make up a package deal where you get a signed copy, C.O.A., and a free sketch to sweeten the deal?