I recommend you discuss and plan this in depth with a local lender who knows your market well. 

I am convinced because listings sites pick markets they think make them more money to advertise.

The stock market has been on a tear.  

Here’s our OPINION for the Metro Detroit market (use as a template for your target area!)

Is there an underlying risk or trend in the market that I might be overlooking?

I would add that SFH airbnb market here is saturated BUT I believe there is still a robust market for larger homes for family gatherings and events.

Since you're focusing on Dayton and Cincinnati, you'll find plenty of opportunities in those markets.

We manage several hundred rental properties throughout the San Diego market and I found your post very interesting. 

But to date, I've just set my rents at a rate that accounts for me having to pay the water bill - and informed the residents that each year I'll increase the rent based upon my expenses (including water), so keeping the bill down helps me to help them.But one problem this could cause is if increasing the rent to cover the water bill then places your rent above the market rate.

Look at their marketing strategy.