Surely though the monetary system requires a mutually agreed upon standard for the medium of exchange. Thus it does not matter what the item used as currency is- historically in the Pacific cowrie shells were used as money as all agreed on their value and their value was the same for everyone. This consistency is very important. What is the value of a load of hay to me? Nothing at all - but to a drought ridden farmer its worth is priceless. The barter bux would become just another currency model as people would try to trade in them and not the goods. This would not be possible large-scale, though small scale, as in Club Med money it may work, but as we globalise strong currencies will become more highly portable not less and there will be no room for minor ones.

However it is a nice idea. I find it very attractive and I hope you prove me wrong!