It's performed great for me and my partners.

Turnkey operators don't work like that and they are more like a broker collecting a fee for their work (regardless of the long-term performance).

Selectively winnowing out the properties that are not performing well, not trending well, or with capital expenses looming. 

@Dwayne Clarke going to take an educated guess that what you were cautioned about is buying someone else's problem.Over the last couple of years, many OOS investors bought a bunch of SFR and MFR properties with LITTLE due diligence.Many were sold Class C & D properties that they thought, or expected to perform like, were Class A or B.Once they figured out what the properties really were - via tenant nonperformance and never-ending maintenance issues, they looked to sell them.If you know what you are doing, their loss can be your gain.If you are new and do NOT know what you are doing, then you'll just be the next "sucker" that gets taken.

I have a sub to like question along the same lines.I own a STR that is performing well (30% COCR) and I want to scale my business.My parents own a few properties in cash.

I don’t know anything about TN real estate but NV real estate will perform better than most of TX with much lower property taxes, zero foundation issues, and cheaper insurance. 

If you walked up to Michael Jordan and said, "I want to learn sports" he would walk away.

I personally own and host 14+ high performing short term rentals.

Reality is few markets have out performed San Diego in residential ROI and no one should be choosing a different market based on historical ROI.  

In Toledo when performing an eviction, you have two options.