The Globe and Mail reports in its Wednesday edition that in 2015, "Kevin" made a bet in his tax-free savings account on one company, Tesla. The Globe's Larry MacDonald writes that value of his TFSA now stands at $1.2-million. As TFSA contribution room became available in subsequent years, he added to the Tesla position. Kevin wanted to take on more risk to capture larger gains that would enable him to reach his goal of retiring by the age of 55. Kevin, now 51 and a technology manager in the mining industry, picked Tesla because he could understand many of the technical aspects of its vehicles, as well as the appeal of the features they enabled. He liked, for example, how Tesla's software could be updated remotely. He was also impressed with Elon Musk's success at companies like SpaceX, and thought he was a charismatic leader who got things done. He also liked that Mr. Musk was building out a charging network to support adoption of Tesla's electric vehicles. Kevin wanted to take on more risk to capture larger gains that would enable him to reach his goal of retiring by the age of 55. "I was definitely on board with the quote from Warren Buffett, 'Diversification may preserve wealth, but concentration builds wealth.'"