I'm sure if the idea pans out, many insights will be gleaned.Which section of the market?

Half of those calls pan out to a rental. 

I can't count the number of fill valves or flappers I've replaced in a toilet on both hands and feet. 

The big thing that jumped out at me was the lid to the toilet tank is missing.

If you live in an area with rodent pressure (like adjacent to a wildlife area or nearby an infested abandoned building) you can not let up on the vigilance.A pest control expert told me rodents will run along baseboards and often pick an inside corner as their "toilet" area.

If you run out of toilet paper, you probably use five $10's.

You punch your tenant in the nose while fixing the toilet, he sues for damages, your insurance will not cover you.

That does NOT mean you need to study toilet repair, HVAC principles or drive a junky car to your properties.

Loan amountMethod:Take the PMT pan and put the 3 ingredients in it in the order above.

Most of the time the deal doesn't pan out, but I did do one last year that ended extremely well with a fantastic ROI.