Additionally, this can help eliminate applicants quickly based on your minimum requirements for credit score/income/etc.2.

Thorough screening and professional management will eliminate 99% of these types of issues.

Is there any numbers/calculations that one can use which eliminate taxes from the equation?

So by going into negative cash flow, you are eliminating one potential profit center, leaving the speculative profit center, and forcing the need for that speculative profit center to offset even more in expenses than it already would've needed to (the negative cash flow) in order to be profitable.So, it's a risk thing. 

With rent control extending to single family homes this would likely be eliminated.

It's those maniacs that buy homes cash via quit claim deed off of craigslist that really get screwed.Make sure your property manager is a licensed real estate brokerage.Understand you can not eliminate all risk, only mitigate it.

You shouldn't look at it as an eliminated expense, its just an expense you are paying to yourself.

Working with an established investor eliminates a lot of uncertainty.

Those improvements didn't come because the worker figured out how to make cars 25 times faster; they came because automation eliminated most of the workers in the first place, and computerized controls ensured higher quality output that reduced line stoppages and rejected pieces, and the workers that were left largely pushed buttons that did jobs that used to take an hour and now took 10 minutes by pushing a button.

The reduction or elimination of 1031 Exchanges would have a tremendous impact not just on the real estate market but the economy on a whole.