Considering that the lockout from repeating runs for raids is being abolished in Alexander. I think this topic is a bit of a mute point. People buy runs because they want a clear and people sell runs because they are basically handing off their weekly loot in favor of gil. However in the last stream they already mentioned that Alexander functions off CT rules. Meaning you can rerun each "turn" as many times as you'd like, but you can't roll on anything after you got your one drop for the week. Anyone in a decent FC with an active branch raiding, could just as easily pool in players together from their groups of friends and get a farm going. Would sell groups go away completely? No, not really. But it will become far less common and far cheaper just because the whole raiding process is becoming more open for the core demographic.