This coming from a guy writing up his experiences in the Banewarrens.
And before you say it, yes I know you didn't pay for it.
EBay is inherently based on the old axiom that "one man's trash is another man's treasure." If my wife sells collectible dolls for $100.00 a pop, that's fine - because there is someone who was just made very happy, however long or brief, by making that voluntary purchase. As long as the market will bear it, I see no problem with the act itself. "More money than sense" is an old saying with a DIFFERENT subject, one which I will not get into here.
One of these days, I'll get the gumption to prove the old saying, and offer a bag of my household garbage on EBay and see if it sells.