To name a few: lawn mowing business, marketing agency, video production company, acting career, window washing, SEO services, improv comedy, music production, painting, drawing, guitar, blogging, and photography.

Then they pull the stopper and wash all the hair remnants down.

Wash, rinse, repeat.

I self manage 22 STRs, with the furthest being about 6 minutes (3 miles) from my house.If I had some tips to give someone managing a STR from afar, I would say change the agitator dogs in your washing machine ($3). 

Either paint/wash the brick to match the siding or change the siding color.

I see other benefits, as I've said, but I'm legitimately curious how it works out mathematically, too, and I'm always wrong like you have said.In the example Brian gave where throughout each month his balance fluctuated on HELOC and he was paying (5%, I think) on say a $4000 average daily balance, what was he paying on HELOC interest vs 4% on $10,000 if he left it on the mortgage?

Your collateral that is securing the loan has grown by enough to cover the interest on the loan, so its a wash.

So, not a DSCR piti wash.