BIN with offers enables the possibility of instant impulse sales. If you have a handful of domains easy to keep up on but if ya have hundreds of domains kinda a pain to continually adjust pricing over the months. So I'll do low-medium priced domains at BIN but I keep the gems make offer as don't wanna have something sell at a price I set 6+ months ago as certain categories can heat up/die down over time so I'd rather price after an inquiry on those than constantly readjust pricing on hundreds of domains.
All my Afternic sales have been with BIN pricing. However, I set the BIN at a price that I would be really happy to get, and the minimum price at one that I would be OK to get. The Afternic "floor"pricing is set somewhere inbetween.
I ask because the sales seem to show as GoDaddy and not so much for Afternic. Afternic just shows a handful per month in 2018. https://namebio.com/?s==AzMzIDM2gTM
So why are you listing there, what are you getting from it?