This paper, which you can download in pdf format via the links describes the result of allowing exchange of digital creation within Second Life and the potential of being a valuable learning tool.
Some [players in Second Life] have even setup databases in the real world, tracking inventory, sales, and customer data from their multiple stores within Second Life. Using this data, they adjust product lines, prices, and advertising, acquiring skills and knowledge that would be acquired at far greater financial risk in the real world. For example, residents have discovered that Sunday is the largest shopping day in Second Life and that attractive but simple displays generate more sales. Undoubtedly, some will eventually transfer their newfound business acumen back into the real world.