Exchange...

This doesn't necessarily have to do with consumer behavior, but its a thought nonetheless.  Why hasn't a national microbrew keg exchange program been set up yet by some brewery or entrepreneur?  I'm currently doing a project for one of my classes about starting a brewery.  After doing some research in the field, we found that most beer drinkers aren't brand loyal at all.  There certainly is a low degree of loyalty, but for the most part, what we found was that beer drinking was very much a hobby to most people, with the goal being to try as many different beers brand and styles as possible.  With this being said, if there were microbrews from New York, Vermont, or Kentucky available here in Montana, my belief is that people would want to try them.  And visa-versa, if our beers were available on the east cost, i believe people there would be crazy about them.  A website could easily be set up in which bars and pubs could bid on the beer that they wanted.  It would be a great selling point for that particular bar to say that they have beer from across the country available, that would change weekly.  Not only would this benefit the bars and the consumers, but it would spread the availability and popularity of the different microbrews.  This idea could help establish distribution on a nation wide scale rather than a comparatively small regional area.  Shipping, of course, would be the largest cost, but what other problems do you see with this idea?  Would you go to the Bacchus or some other bar in town more often if you knew they had a different microbrew each week from across the country?