Bad apple spoils the bunch scenario.

You obviously wanna compare apples to apples.Also, are you using the average rent  or median rent in your analysis?

If I have a question for my realtor as to what my local comps are for a property, I probably wouldn't be pleased if my realtor sent me a smaller bill for that time to do the comp's.I realize it's not an apples to apples comparison (as realtors usually receive a commission), but in the world of real estate I find investors like that approach (as it aligns with their normal communications with other contractors in their business). 

I went to the APP store to download the BP app, but when I type in Bigger Pockets Apple can't find anything that is related.

If the Management Company puts in a bad apple tenant, then they will share some of, or all of, the expense of removing that tenant and getting a new tenant in the property (depending on the terms of your management agreement which should also be reviewed by your Attorney). 

Large firms (goog, Apple, FB, etc.) will still be hiring. 

you are always going to find the bad apples.

What I am saying, though, is make sure you are really comparing apples to apples when you count all that money you think you are saving.I liked some of Gary's analogy.

If you want to compare apples to apples you'd have to use IRR for REI.

It's very easy to end up underwater if you buy in one neighborhood thinking the prices are going to be apples to apples next to another neighborhood.