(Less competition seeking for Properties) while supply keeps decreasing, demand keeps so ... rents keep moving upwards.I will chase Curtis down ! 

It's true for many Americans - in fact, the man who created the 401(k) in the 70s regrets it, because it created a false sense of security and many will indeed find their retirement savings woefully inadequate.

I know that I will only occupy a unit for a limited time, and the house-hack is just a way to get more favorable rates, better loan terms, and elminate, or severely decrease my housing costs today.I am sure there is someone on BP who has built some wild spreadsheet, or other model where you can actually calculate the value of no mortgage, but for me, as long as I am covering most, or all of my PITI while I am occupying a unit, and the deal works as a stand-alone investment deal, then I am done running numbers. 

As for investing in "ghettos" I would say I have invested in mostly "ghetto" neighborhoods and have seen the crime decrease steadily over the years and the demographic change rather quickly.

I decrease the downside by working with a PM that knows how to screen these types of tenants.  

The cost per use of the Loan decreases every time you use it.

However, I'm starting to see a lot of price decreases on listings.

I agree with many of those investors that a correction of some sort will happen but I am under the belief that it will not lead to prices decreasing much but rather stagnating for a few years.Though @Alvin Sylvain says he is new to investing, he has the right idea.

Find a way to improve the physical property AND the operations to increase the revenue and decrease the expenses. 

Because, as you might imagine, a tenant turnover will cost considerably more than $225, but as @Thomas S. mentioned, the actual insulation bill for an attic will be considerably more than $225.Go to www.homewyse.com (I love this website by the way), select "Installation", then, "insulate attic" and see that their rough estimate range is from $1.59 to $3.08 psf (labor and materials), but then it depends on whether they are insulation batts, or blown in type insulation.In any case, if the existing attic insulation is inadequate, then maybe this "upgrade" might be warranted, regardless of how long the tenant has been there.