A financial planner, such as a CFP provides a lot of benefits beyond fund or stock investing. Some Financial Advisors are also CFP's.
My comments below are specific for FA that are not CFP's.
There are only two reasons to use one, in my opinion, in today's age
1) They make investing easy. They sell you to buy their products, and divert your money away from clothes, travel, restaurants, cars, etc.
2) They make investing easy. Lots of people don't want to think about investments, and if they had to rebalance themselves or initiate a buy / sell.
So, hiring someone else to make the the transactions go through for you does have a lot benefit to some people.
IMO, this is only worth 1 hr every quarter, x $200 per hour (max) plus a one time set up fee of $200. (this pays the business overhead, too). So $1000 for the year..being generous. or 1% of a $100k fee, or 0.2% of a $500k account....