This is a tough time of year to sell a moped, scooter or motorcycle in the northeast. The best time to sell is in the late winter/early spring time frame, when people are fantasizing about riding again.
I recently posted a few of my bikes on FB Marketplace. I quickly tired of people offering me less than half, for my already very reasonably priced bikes, so I pulled them all off FB. This time of year, all you get are what I call, the "bottom feeders". These are the a-holes who are just looking to get something for nothing and then flip it for 4 times what they paid for it.
Your best bet is to hold them until spring unless you really need the money or space. (edited)