For the folks with less than 10 rentals that are local I completely understand the desire to DIY. A good percentage of our clients are military who get transferred out of area. We provide a very valuable service especially when that person is deployed and cannot deal with the issues that arise.
@Jerry W. I agree with your expectations. The great thing about our portal is a landlord can log in or set up notifications for payments, maintenance calls, etc... This way a landlord can be involved as little or as much as they would like. Some would like us to earn our fee, others are happy to manage it along with us.
@Jesse T. You brought up a very important point. A property that rents for $1K a month even at 10% does not justify the fee to manage it if it is a troubled property (bad tenants, tons of maintenance). Here is Jacksonville driving to and from one side of town to the other to check on a place even twice in one month eats up that $100 fee. It is about picking and choosing the right properties.
I do believe property managers serve a useful purpose. Once quick story, we had a client who was renting his place DIY for $1400/mo and asked my broker to place a new tenant at the same price. Given my broker's experience with the market he suggested listing his place for $1800/mo which was inconceivable to the client. The place rented in under at week at 1800/mo. Good DIYs know the market but maybe not as well as someone who does Real Estate on a daily basis.