But we are routinely generating $30k to $50k profits per house.

Reality is more painful, with vacancies, new roofs and routine maintenance all "eating away at the profits".

If you can repair it to routinely work correctly then no you don't need to replace the door.

This information is routinely provided to businesses (particularly those looking to move into the area), investors and others that have an interest in the area.

I routinely review all ADU permits filed in Oakland, which has marvelous public records act management systems in place. 

I find leads pretty routinely.  

No PM is going to check with you for every small routine repair, but usually there will be a $500 or $1000 max SINGLE repair cost without owner approval except in emergency (such as blown water heater or furnace).As to your comments about ads, "replies" do not equate to "qualified tenants".

I routinely use Pex in all my rentals.

I routinely work on commercial loans with 20-25% down.  

I can help look for deals, organize data, help with paper work or any other routine task that is part of managing property.