We agree with Warren Buffett and Peter Lynch that most investors would be much better off investing in low cost index funds rather placing their trust with high-cost fund managers. That's not to be confused with the value of working with a fee-only advisor. A good advisor does many things which will help you significantly: match you with a mixture of assets most likely to meet your needs, help you manage your emotions in both good and bad times, plan and manage cash flows in retirement, etc.