I don't ever have a problem with people advertising their epics for sale, as long as they don't post the item more than once per 2 minutes. Don't double or triple post it, that right there get's a spam flag. the report system works just fine... if the other players think you're spamming, that's how they let you know.
I felt that way with Rift, Star Wars, GW2... and mostly I was right about all of them, population dropped to below 25% on each from their highest numbers. This game though.... I feel the DnD crowd will keep it above a 60% hold. As long as content keeps coming, they will stay firm. If content drops.. so will the game. Still…
It's something you need to be more aware of in the future. MMO players tend to shoot first and ask questions later. Use the auction for low to mid range value items. Other than that, just level and get to the next level.