We have 8 doors now (3 duplexes and 2 single family homes) and want to buy another 4 properties over the next year.  

Buyers will open doors and notice. 

I am an OTR truck driver who came on the road to cut out all expenses and save up for a career in aviation as a pilot.  

If you open the door the drum stops (door switch works fine).  

It's been doorknobs, toilet seats, door frame, we even had a plumber out to snake his bath tub because he said it was draining slow.

The constable will be at their door and give them 5 minutes to vacate!

Also left a note on the door saying I was interested in buying the house hoping a relative might find it and noticed that the mail was in someone else's name?

Do you have a drivers license? 

But as soon as you gain experience through life's ups and downs and get to the point where money isn't a problem anymore, you will get tired of the police calling you at 3:00 am because some dude decided to beat the crap out of his wife and threw her out in the snow and the cops want you to come down and open the door for them so they don't have to kick it in.

A 3 bedroom 2 bath home has only one hvac system, one water heater, one garage door, 2 exterior doors, and no wood deck that will rot every 7-10 years.