Can you imagine coming home to find 'friends' helping themselves to your kegerator uninvited? Or worse filling and taking growlers? I think I'd cr@p a bomber. I do share a lot of beer and friends are welcome to come over to visit and sample to their content. Folks seem to know that if they give me honest feedback and return rinsed bottles I'l keep bringing them pleasant surprises.
As far as the inventory issue goes I'm not going to worry to much about having too many kegs in summer storage conditions for too long. I believe Tom had some good advice a while back. Something along the lines of, "if you're worried about it going bad, have a party". That sound easier and more fun than building a cold box and closer to the truth, more likely to get buy in from the Brewmistress.