Interesting topic.  As some one who has recently had a huge increase in portfolio size due to sale of a business I had to make some decisions about who to go about best managing much more money.

I have an advisor and have worked with him/team for about 15 years.  We look at 3 points in that time, return before 2007-8, 2008-11 and after.  In that time it averages out to just over 6% return after fees.  

In that last 5 years it's over 9%.  Is he a genius?  I doubt it but he's able to see things and do things that I would never be able to.  But most of all there are quarterly reviews, that assess the market, risk profile, income needs and more.  I don't want to manage this while I do other things. I don't want to get up and worry about my investments based on how the market is doing one day, week, month or year.  There is value in those fees to me because it's his job to worry and he knows my concerns. 

I get DIY investing but you also can't handover money with blind faith either