Even if you only averaged 2.8% appreciation annually, which if you've had it 20 years I have no clue how that's true given prices have well more than doubled in that time, youre skipping over the fact that you have been benefiting from that appreciation on the ENTIRE house, not just the % you paid for.  

I just started using it and so far the owner info matches up with the county tax info. 

Far more than most real estate acitivies and much quicker think about it.. you sell the same info over and over and get paid instantly you have no roofs to fix no tenants to manage etc etc.. you do have reputation management of course.

Competition with owner-occupants and the age of the homes (70-120+) will squeeze your margins and expose you to a fair amount of risk.

@Jonathan SmallI agree with the previous posts.

Also, what is the equity in the property?

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

Aaaaa this is weird, hell must-a frozen over because we are in agreeance..... 

The original six month tenant I had extended the lease 9 times and stayed a total of 5 years, paying me about $15k over market rent annually.  

--- The worst condition a property is in, the fewer buyers interested, so the bigger opportunity it respresents.