My BIL is an auction hound...and I have gone to a lot of them with him.
There are still some local auctions that are NOT internet bidder enabled. I mostly stopped attending auctions with internet bidders, which seems to drive prices higher which is good for the seller, not so much for on-site bidders.
Most of my recent implement purchases have been from Fakebook's Marketplace.
I just picked up a solid deal on an 8' Harley Pro Rake in very good condition...but only after passing over a lot of wrecks online.
Auctions are worth "watching" to gain informed knowledge on the going price for used equipment, which helps to establish your highest price before negotiating a Marketplace purchase.