To answer the OP, it's only a matter of time until that book begins to come back to a realistic selling price. Each day you hold out waiting to sell it is just risking
missing the boat altogether. The prices are already way out of line for a book so new. If you have no attachment and are just trying to make some money, sell it
now. It's very unlikely this comic will hold its value over a long period of time, and you should be able to get it cheap somewhere down the road (and probably
not that far from now). Very few books skyrocket so quickly. Take advantage while you can.