There was a set on CL around here a couple months ago, they were a bit a drive for me so I didn't bother, the seller was asking $250. The grills were rotted, just the frames remained, and the wood showed signs of maybe being stored in a basement. They sat for weeks being relisted several times.
I finally was in that area and went to look, they were in better shape then I had expected, but with some light mildew on one cabinet. The seller had no way to demo them, I had no clue if they worked or not. After some haggling I got them for $75.
I cleaned up the cabinets, gave them a listen, ordered new foam grilles, and they are sitting till I get back to them. A buddy listed a minty pair which he had since new there over the holidays for $400 but got no takers. His look brand new. He sold his dirt bike instead and put the speakers back in the attic.
In all fairness though, I think the max for a CL sale around here is about $25, regardless of what your selling. Even then you have to field dozens of scam emails and those just mining email addresses in hopes of finding a real buyer.