There are a lot of resellers out there. I unload a bunch of my Hasbro stuff to one of them. He was also interested in my Lego and SS stuff, but I didn't go down that road with him. It all depends on what they offer you. I just had a FB marketplace guy try to lowball me on one of my listing. He wanted to pay $100 for a set that was fairly priced at $225. I replied "you are offering less than half?" and he replied "bro, I do this for a living" and then proceeded to send me a listing for around $130 for an open set. When I replied that mine was factory sealed and priced fairly, I didn't anything further. You will get a bunch of this nonsense. I sold a bunch of my carded figures with Star Cases. I had one guy lowball me on a set. I told him I could sell at a lower price without the Star Cases and he replied, "how am I supposed to resell them without the cases". Many of the resellers feel entitled to get your stuff for cheap so they can make their own profit. Told that guy just to send me his buyers names and I would sell direct to them.
As for FB marketplace, you need to give it time. There is an ebb and flow. I will go months without a sale, and then get a bunch in a two week period.
