Despite a tough year for emerging market equities, due in part to high inflation and systematic risks from the core economies, investors still like the long term investment thesis in the emerging markets, by and large.
It makes no more sense to ask why a Lean Startup has not returned its investment in a truly spectacular way than to ask why a student term paper or senior thesis in college is not a Harry Potter level bestseller.
Regardless of which commodity you choose to put your money in, be sure that the macro fundamentals play into your thesis in the near term and the long term.