Investors are completely ignoring Tesla's biggest flaw (TSLA, GM, F, FCAU)

NTB Scanpix/Heiko Junge/via REUTERS You can't argue with the numbers, can you? Tesla shares are up almost 60% since the beginning of the year, hitting all-time highs in the near-$350 range, and CEO Elon Musk's electric carmaker has returned 1,670% since the 2010 IPO. The market cap, at more than $50 billion, is bigger than that of General Motors, Ford, and Fiat Chrysler Automobiles. The Big Three are now the Big Three plus one tiny carmaker in California that investors think will take over the w...