Insurance costs change.

Here's why:-Management: One property tax bill, one mortgage, one insurance bill, etc.

Maybe paying off credit card debt or other debt on your report to reduce the minimum payments, increasing the downpayment, finding a house that doesnt require HOA or flood insurance (if applicable), etc.

Income Late fee Gross rent Expenses Advertising Cleaning Gardening/lawn mowing Insurance Interest on loan(s) property tax Legal expenses Pest control Property agent fees/commission Repairs and maintenance Water charges Electric Bill Total expenses Net rental income or (loss)

Add a very diversified economy here with banking, insurance, oil and gas, education, three medical schools, 3 law schools, life sciences, DFW airport, and so much more, it looks like the growth just goes on and on.As far as appreciation goes, that's always tough to predict. 

Many find a better route is building a fortress of insurance coverage. 

There is no insurance that covers an increase in HOA assessments. 

Like @Jay Hinrichs said, it's just cheap insurance..... my clients that buy my new builds will do sewer scopes as well.. we have not had any bellies but we have had debris and rags etc stuck in them.. better to find them up front than to have a back up in a brand new 750k home LOL..

You also need to account for taxes, insurance, HOA dues and management fees. 

The income (rent minus management) should cover the costs (principle, interest, taxes, and insurance) depending on the property's price point.