Why not have a separate shop in the Battle Forum section so that we can sell, buy and seek the weapons that we need to defeat the denizens of the Coliseum. Right now it is hit or miss if we notice whether or not somebody is selling something we need. If we had our own Battle Market that we could visit it might be easier to obtain our supplies.

There are plenty of ways to find weapons for sale - trades, advertising forums, shop search. I don't think we need a shop. Besides, what were you thinking would be in the shop? Anything other than the stuff already sold in the official Subeta weapons shops will get a firm no from just about every battler for endless reasons :P

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Or do you mean like a forum for advertising? That would be kinda cool I guess, but they have pretty strict rules forum-wide that selling anything has to be done in the Advertising Forums, and I don't see them changing that just for weapons.

No other forum gets a special treatment like this.

Training your pet up for battle takes time and dedication. Checking the regular places for weaponry that you want is part of that. Someone hoping for that CW with only a few copies made might stalk the same boards.