This is defined as "Emergent Gameplay" if people want to use 3 of the same class that's their prerogative. Binding items is no good here anyways since it only goes to the same hands, there is no trading system so nobody else can get them so no need to lock them. If there were a trading system binding gear would make sense. Also coins are just another form of currency, hardly exploitable given that they cant be reliably farmed outside of 7 day intervals