Everybody who's ever had to leave the flying field because they were out of a $4 item has thought of this idea. The real killer is someone to run it. You'd have to invest a good $1000 in inventory just to have the basics of everything that people might need. So who keeps the key and manages the money? Are you going to let every club member have access? That would be a real effective way to get rid of $1000 of the club's money if that was the goal.