I would only pick them up if I was with a community that used them, otherwise it would be worthless to others and take up space. If others were trading, however, I would love to use them ATM my clan just gives each other what they can spare, and picks stuff up for each other. with this system, we don't need currency. And when we do trade with other clans, we usually use food and ammo/mags, and guns in larger transactions. When base building is implemented and we settle down, however, we are looking into a uniform currency system for sure, and the giving will stop.