Recently I have been taking an accounting course, and realized why the banks pour thousands of dollars into these more distressed"houses", that are sometimes no more than a shack with 4 walls and a door.

The two easiest drivers of that idea is (a)  You are acting like one so you should license up to get educated on what it actually means to lend in your state along with any compliance you need to follow.  

I am sure you would have a line out the door.

There are a ton of bad drivers on the road each day.

If its ugly, or maybe a barking dog next door, or even on a slightly busier road.  

Taking everything into account and some numbers are estimated high it figures to make $125 per door after we pay property management. 

Through active marketing (door-knocking, advertising, yellow letter campaigns, etc.), reaching out to these owners can yield leads that in turn can lead to property purchases as a significant discount from market value.The process of finding discounted properties, especially for the newer investor (like me) can be daunting.

Christophe,You need to first start with how much money you have to invest in the United States.If you have large quantities of money 500k, 1million etc. then more doors open up for you. 

There aren't many updates that need to be done to make it tenant ready; a couple door replacements, small bathroom fixes, and cleaning out tell unfinished basement which the owner started to make into other apartment but ran out of money.

My next door neighbor also has a a duplex and he's looking to sell and I want to buy it.