I donate to pinside monthly and have for a while. I don't sell games, I buy them. Policies like this drive sellers away, Stang being one of the big sellers. So him leaving this site becomes less of a resource for me and other buyers. I'm not worried about not seeing Stang's games I can text him and see what he has. The thing is that takes Pinside out of the loop, and that is a bad thing for Pinside.
Stang is the type of guy who shows up with a truckload of 5-6 games in various condition. He posts a quick blurb here letting people know what he has, usually while they are still in the truck. Having to take detailed pictures of all the games when several are going to be beat up projects is counter productive to how they are being sold. A quick mystery project game off the truck, $200. A game that has been photographed and gone through suddenly is now is $500. This also distorts the estimated price Pinside places on games. If a project game gets passed around as they do, just look back in this thread. Then you end up with multiple under-priced sales. This drives down the average price on this game artificially.
I agree if your going to post 12 photos of a $2,000+ game you should use a marketplace ad, your going to get better exposure. But for the unknown raw project games, sometimes a marketplace ad is overkill. I get needing to monetize the site, but I think the regional threads help for some things. There needs to be a price point of Pinside sponsorship where people can donate a set value and not have to pay any further fees, or have local regional player just sponsor this thread so it can be back to what it was.