There's not enough margin in houses and lots of things are beyond their control. 

Those three things you control.  

@Lily Nelson generally if you are priced right and listed on the major rental sites in a city of decent size you shouldn't have a problem, keeping tenants has a lot to do with the quality of the unit but some things are beyond your control, responsible tenants eventually buy homes in most places. 

Oregon Rent Control: https://www.npr.org/2019/02/27/698509957/oregon-set-to-pass-the-first-statewide-rent-control-billForbes (How Tiny Bozemen MT Became A Booming Tech Town): https://www.fastcompany.com/40419011/how-tiny-bozeman-montana-became-a-booming-tech-townNowadays, every small market that has a bit of tech influx is dubbed the "Silicon (Insert Local Geographical Identifier Here)".

It is a low power way for devices to communicate.

In terms of SFH, the appreciation and control you have on the home will be more but the typical buyer who purchases that kind of property is usually owner occupied meaning that their math on the home is not going to be numbers that 'make sense' to investors but rather an emotional purchase.

He holds all the cards and has no reason what so ever to cut you a better deal . he knows the area and controls it .

That's true passive income right there.One thing you lose though is CONTROL but the more control you want, the less passive the investment becomes.

It puts the tenant in control when he should not be.

It's a brand new yellow gas flex lines, that was attached to an existing line that goes to the main valve (that control gas coming into or out of stove).