If you see his other posts, he quantifies the "opportunity" cost of having equity tied up at 10% yield.

One way to quantify it would be to pro-rate the rent for the number of days that the tenant had to be out of the house, but you also need to account for the ongoing electricity issue.

Risk is relative to how each individual investor quantifies risk in their own mind.

What I want to add is:1) when evaluating returns, try to quantify the tax benefits of MFH syndications as a part of the returns!

But also consider everything else real estate gives you and try to quantify it and see if the deal makes sense for you.

Outside of financial freedom, it's cultivated a freedom of mindset you can't quantify.

If you can't quantify this as a deal without all of the "extra" income (because you would clearly need to clear all of that out of there), then it isn't a deal in my book. 

Investor friendly agents generally share some of these traits: Great analysis skills, software, and tools with a wide understanding of the market (others too, to add context), investment strategies (able to elaborate and quantify them), well connected and credibility.

Can I quantify revenue for the additional work involved in created a visual portfolio?

I had that good fortune and it is hard to quantify.