i'm not sure my 89 f-150 even registers on my scale of networth..perhaps i should say it's .00001% of my assets, give or take a few decimal places

Response rate is about .5% (not the decimal in front of the "5").

Or a major employer pulls out of town and his tenant pool is decimated.

However, I have a cash buyer who has the majority of his investment funds (a number with 7+ decimal points) deployed in the stock market.

I realized that I was simply not converting the percentage into a decimal correctly for both problems.

, which cost us close to 100k extra altogether, and decimated our profits.

Typo on decimal places.

I misplaced the decimal point and cut my debt/year in half.

the decimal point didn't make it in there. 

Duplexes in my neighborhood get pretty much the same rental yield as a SFR assuming you were to buy one now (5% with a varian of a few decimals), if your neighborhood is like mine, you might as well just rent it out as a SFR if you are getting the same yield and maintain the liquidity of your property, as I generally find duplexes a little harder to sell compared to a SFR in my area.