This is because you will be using reserves from your own pool of money versus a hard money lender.

Account Closed I'm maxing out on the pre-tax contribution amount every year, my employer matches 5% of my pay contribution, the markets would have to have an average loss of -15% every year for the next 25 years for me to end up with a balance that consist of just my payroll contributions.I think those numbers on the charts you're listing are for people working low wage jobs and probably contributing a few hundred dollars a month to their 401K plans, in that scenario putting 200-300 dollars a month away is something that will help but probably not going to be enough to live on in retirement.Like many have mentioned on here you have to be diversified with Real Estate and various aspects of the financial markets, If you're heavily positioned in one market or the other with no diversification you'll end up in the average pool of investors.

Personal computers wiped out typing pools, but not total employment.   

Obviously, these people still deserve safe housing, just like everyone else, but from an investment perspective, they are a higher risk pool.

Condos are harder to get loans for which means harder to sell.Condos are everywhere and so they don't appreciate like single family.Families typically prefer houses so condos have a smaller pool of potential renters.And why pay 100%?

I ended up with a 4/3 with a pool.

The cost of the repair is$27K and don't want a pool either. 

My long-term goal (15+ years) is to have a portfolio of rentals for income, a solid retirement pool, and additional capital for investment to provide to the next generation of "doers" who want to flip or buy-and-hold.

I came across a single family property with an inground pool that is good for a fix and flip.

That is a huge deterrent especially in an area that might get  a lot of cold weather and snow.There is a much smaller pool of buyers for houses with steep grades.