Your own personal feelings on how the thread should be run is your own business, and you're entitled to your own opinion, but don't come in here preaching telling everyone what they should and shouldn't do.
What you think the buyer's duties and the seller's duties include is irrelevant, we aren't here to listen to you try to dictate. We're here for the deals, take your frustration out elsewhere.
The bottom line is, this will increase the efficiency and success of doing large groups like this.
CAG: a place to buy/sell/trade games the right way.
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