Sorry but I wholeheartedly do not believe you read the initial post nor understand how economics works.
OP doesn't want "the market to meet her budget", she is simply looking for a seller to match her price range, and this is, in its most basic form, how "economics" works. Buyers and sellers come together to exchange at prices which they both agree on. Sure her price range might be lower than the market average, or what the majority of sellers are requesting, but that literally doesn't matter because her post didn't ask, nor was it directed towards people who are selling their bags for a premium.
Ps. your "but I certainly wasn't on a forum asking people to sell me their bags for less, especially a group of consumers who know market price" sounds like you're shaming OP for simply trying to find a seller in her price range.