I think this is a great idea. It's low cost, low investment for the business and it strengthens the coin, it even has the potential for the coffee shop owner to hold a large amount of a coin with growth potential. I see this as a win,win,win. The first brick and mortar to accept Burst for a tangible good. Congratulation on the initial success of this project.
Irony: Remember that guy that bought 2 Papa John's pizza for 10K BTC in May of 2010? It was the proof that made it real. However if some day burst was worth 1Euro those cups of coffee would in the future be $6,500Euro. Hope it tastes good.
Today is National Coffee Day in the US, enjoy a cup or two, maybe three.
-IceBurst