That's a good point. But on the same note, I don't really see any fair way to solve this - lets say ok, B gun+18 is a bit too much. But where do you draw the line? +16? +15? No matter which you decide to be the max, there'll always end up being someone who'll get screwed over by this, making his gun unauctionable because he was lucky.
"can be closed in few years"... Club is far more succesful than official classic servers, so I don't see a reason why it's such a big deal it's private server. If Innova/NCsoft had a real leverage to close this server they'd have done it before it caused their servers' demise.