"We brought in some comics to sell."

Great!

"We looked up all the prices online."

Great! I'll go through these fast as to waste as little as my time as possible, since I'm never going to come close to whatever prices you've made up!

Not trying to be a crook, just trying to make a living. I can't can't sell this $10 comic for $80 so I'm not paying you $60 for it.
@mikester "But I looked it up online -- there's a copy on ebay now for $100!"
@SKleefeld @mikester it’s been there for months, so it must be in demand!