Auction houses aren't centralized in vanilla. You can only view items listed at the particular auction house you're at so you can just kill anybody standing near the auctioneer before you list your goods if you're worried.

Just be prepared to get swarmed by goblins.

I hadn't even considered playing on a PvE server. Seems like it would take half of the fun out of the vanilla experience. Though if /follow is disabled in world PvP I suppose it's not much fun for us either way.