I'm going to be attending Societe's anniversary party in a couple of weeks, and am thinking of picking up one or more growlers of The Pupil for trade. Societe's growlers are $25 (stainless steel), and $15+ to fill. I've been the first one to argue that gas/time/etc. shouldn't be factored into trades. However, is it cool (or not) to ask someone to send that $25 growler back to me?