Brad,
May I call you Brad?
Anything is possible. But, the seller does have a good feedback rating.
I've never sold anything on eBay. Maybe they didn't post a "best offer" option because that might then be binding? Like I said, I'm just guessing, having never listed anything for sale. It just seems like there must be a less nefarious reason behind it. Again, I've seen people do this occasionally.
You could be right, and there could be some sort of shenanigans afoot. I just feel like it's probably something a lot less diabolical.
I'm not on a device right now where I can log in to my account. When I can, maybe I'll shoot them a question, and just see what they say.