A friend of mine and his wife have been running auctions on FB groups they created for about 3 years now. He doesn't limit himself to just FB. He runs auctions on eBay, sells on Kijiji, and other places. They make a good living at it.

I haven't asked him what he makes specifically on FB, but with so many other places to run auctions, if he didn't feel it was worthwhile, he wouldn't be doing it.

Regards,
Steve