Selling at flea market is sometimes odd.

I've been storage auction buying since 2011. When I have alot of smalls I take them to the flea market for a quick flip. However sometimes I take a big item or two to draw in a crowd. When I do I stick to my prices on the big stuff, that way if I sell it I get what I want, if I sell it too cheap then I also lose the attraction. But lets say I have a really good window A/C. I find out its retail is $179, and I ask $100 on it. All day long people will low ball me. At the end of the day another vendor will offer me $90 on it and at that point I'll give in so that I don't have to lug it back home. But then in less than 10 mins they always flip it and get more than I was asking. Weird!