Looking back at its history as a public company, Tesla (TSLA -0.67%) has generated serious wealth for investors. The auto industry disruptor has seen its shares skyrocket 20,290% since its initial public offering in June 2010 (as of June 25). Had you invested just $5,000 back then, there would be a$1 million balance in your portfolio right now.No one would argue with that kind of impressive past gain. But will the leading EV stock be a millionaire maker in the future? Assessing Tesla's true valuationTesla ...