Or want to get absolutely ripped off by the non-government sellers that are somehow allowed on those platforms. The whole point of Govdeals et al is that the seller is a known-ish quantity. If I wanted to roll the dice on garbage with fresh paint I'd be on Ritchie bros.

Govdeals managed services (or whatever they call it now) is just as questionable as 3rd party sellers on any given big bog store's ecommerce "platform".