The macho guys on Wall Street can’t stand plan vanilla and are always seeking new ideas to push off on the investing public. It has been reported that Blackrock Inc., T. Rowe Price and Fidelity Investments have been taking stakes in high profile startup companies, many of them in Silicon Valley. These are the kind of investments that either pay off big or go broke. Last year these three were involved in 16 private funding deals, up from nine such deals in 2012. So far this year, these three h...