I have seen a few members here do this with success, and would also like to understand more from folks who have been successful with this.
I tried doing this last year. Put BIN both on Afternic and GD Auctions for 3 months. In those 3 months, I saw no action through Afternic, but a few sales and offers within the GD Auctions portal. No transactions from Fast Transfer Network (in the previous months, the FT transactions were quite active). I deleted all GD listings after 3 months, and the sales again started to flow from Afternic FT network. My *hypothesis* is that placing BINs on both places confuses the system.
Whether you can place BIN on Afternic and put the same domains on Make Offer within GD auctions without jeopardizing either platforms, and whether it results in a better sell through is something I would like to know as well.