The denominator in the calculation is your capital/equity and with no debt the return on your existing equity is low.

They they get a big fat default judgement against you. 

Install low flow water heads, swap the washer/dryer with High Efficiency models, replace the water heater with a tankless version and lock the temperature at a reasonable level, install smart thermostats that will automatically reduce the heat/cool when it senses no one is home, swap all the lights for LEDs, etc. 

With any investment there are risks, but how much control you have to mitigate risk is what makes the income snowball a low risk strategy.

I kept the rent low because the tenant was there for a long time. 

Low employee needs.  11.  

They are a commodity, and owners are competing directly against hotels in this space, so rents are ultra low.

Those that preach no/low down payments are mostly just trying to appeal to the masses who want everything for nothing that will buy their courses.

She isn't thrilled that her refund is so low but I was able to give her an exact account of the revenue minus expenses and she thanked me.Far fewer phone calls.

As a builder, I target about 15-20% profit per build ($500k-800k price range, low-mid in my area).