Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why not just invest in the market?
Let me start by giving you a snippet of a report that will floor you. Beat the market? Investors lag the market by so much that many call the industry a scam.   This is the 2015 year end data from a report titled Quantitive Analysis of Investor Behavior by a firm, Dalbar. It boggles the mind that the disparity could be this bad. A mix of stocks and bonds over 30 years should average 8.5% or so. Take out fees, and even 7.5% would be the result I expect. The average investor return was less than half of this. Jack Bogle, founder of Vanguard, and considered the father of the index fund, was ridiculed. A pamphlet I got from Vanguard decades ago quoted fund managers as saying that "indexing is a path to mediocrity." Fortunately, I was a numbers guy, read all I could that Jack wrote and got most of that 10.35%, less .05, down to .02% over the years. To answer the question: psychology. People are easily scammed as they want to believe they can beat the market. Or that they'll somehow find a fund that does it for them. I'm tempted to say ignorance or some other hint at lack of intelligence, but that would be unfair to the professionals, all of which were scammed by Madoff. Individual funds may not be scams, but investors are partly to blame, buy high, sell low, and you get the results above, I dare say, an investor claiming to use index funds might not fare much better than the 3.66% 30 year return above, if they follow that path, buying high, selling low. Edit - I am adding this line to be clear - My conclusion, if any, is that the huge disparity cannot be attributed to management, a 6.7% lag from the S&P return to what the average investor sees likely comes from bad trading. To the comments by Dave, we have a manager that consistently beats the market over any 2-3 year period. You have been with him 30 years and are clearly smiling about your relationship and investing decision. Yet, he still has flows in and out. People buy at the top when reading how good he is, and selling right after a 30% drop even when he actually beat by dropping just 22%. By getting in and out, he has a set of clients with a 30 year record of 6% returns, while you have just over 11%. This paragraph speaks to the behavior of the investor, not managed vs indexed.