I'm wading into this a little late, but I'd offer a couple of points to consider.
First, it is unlikely that a financial advisor of any sort will outperform a non-advised portfolio, all things being equal. That is simply due to the fact that an advised portfolio is almost certainly more expensive than a self-managed, non-advised portfolio.
However, all things aren't always equal. An investing forum on the internet is highly tilted to self-directed investors that enjoy spending the time and effort discussing, researching, and making their own investment decisions. Individuals who lack the time, interest, or discipline to invest prudently can experience widely varying outcomes. These individuals may benefit from delegating their investment management to a professional.
That being said, everybody can benefit from having a financial plan. Portfolio management is only one component (investment planning) of a comprehensive plan. Retirement, Tax, Insurance, Estate, and Education are also part of a comprehensive plan. Many times, someone thinks they have an investment question when, in fact, they should be stepping back to look at impacts on other elements of their financial lives.
So, while I agree that not everyone is likely to benefit from hiring someone to manage their portfolio, I strongly believe that nearly everyone can benefit from having a sound plan. YMMV.