Yeah I believe every group has one of those guys. One guy in my group was like that for a few months untill we clued in he never pitched, never gave rides, never bought any munchies. He just tagged along to blaze. So we all asked him about it when we were all high one day. Then a few days later he called us up to burn and he had a half Oz waiting for us to smoke. Then he bought munchies. I hope that helped you at all.
~Bryan~