They perhaps can build cheaper than you can, finance cheaper, operate cheaper and to get it leased up, offer things like 1-2-3 months free rent. 

If the law allows, I will sometimes move the personal items to storage, which is much cheaper than lost rent, so I can clean up the rental and find a new tenant.

In most single family zoned areas adding a single ADU is not a value add meaning it will not add more value than the hands off cost of the addition.  

They may be offered at a cheaper price point relative to the coasts but that doesn't mean that those neighborhoods haven't seen population growth and appreciation.

There are cheaper one’s in D/F areas but I would be careful as those can create a laundry list of additional issues.

Atlanta MSA is great and growing, but Multi-Family supply coming on line there both now and through next year is significant, wouldn't this be a better/cheaper deal 1 year from now?

The cons as i see it include loosing the 2 of 5 year cap gain exception, typically not an ideal rental because the emphasis at purchase was buying a good home for your family and not a rental with optimal return (my ex-home consistently has the lowest cash flow for equity in my RE portfolio), not disconnected enough from the property causes addition angst on damage and may result in over improvement.  

Remember: cheaper doesn't mean you'll make more money.Start by going to www.narpm.org to search their directory of managers.

and soon realized that there was no aviable apartments in or around the same neighborhood for the price that they were looking for. if they wanted cheaper rent?

I am with Suncoast currently.Remember: cheaper doesn't mean you'll make more money.Start by going to www.narpm.org to search their directory of managers.