I find that totally false in my opinion.The older demographic is the largest growing audience and most profitable on facebook.

While you are turning an existing building if it is not completely vacant there is at least some income coming in whereas ground up it takes cash,cash,cash and long times before the money comes in on larger projects.I have a client building a similar size in Salt Lake, Utah but again the higher end renters make the most sense for new builds.

You tried to take them for a profit but maybe they've turned the tables on you.

The rate is much higher than market rate since I wasn't able to get Fannie mae warrantable loan since this complex had larger than 50% investor owner ratio. 

Final numbers 42,000 purchase price 2,000 rehab 9,900 closing cost 17,100 profit for 10 hours of work and a 38.8% return and an hourly rate of 1,710!

Secondly is the profit per door the most important?

I don't pay myself from business but reinvest profits in purposeful expenses or cap improvements for the portfolio.

Cash investors have perceived low risk and higher profits.

Duplexes (or larger) sell for around 115 times rents, while SFH can sell for 65-70 times rent.

You can sell it and take the profits so you can start doing more deals or keep it in your rental portfolio (hopefully in a couple of years you'll have more money saved so you can do more deals).