You’re charging someone for you doing nothing

Go talk to someone who manages a rental, ask them specifically what they do. What do they do when the tenant leaves? What do they do when the tenant doesn’t pay? What do they do when things break? What do they do when there is a squatter? What do they do when there is a bogus complaint to the local government? What do they do when a unit sits empty for an extended period?

The answer to all those questions is most certainly not ‘nothing’.