The other factor is opportunistic price increases.

The reason no one can give you a firm amount is because PMI fluctuates according to a bunch of different factors.

Many different factors such as current expenses, condition of the property, additional revenue opportunities, surrounding neighborhood/surrounding rents. 

Also, thanks for pointing out the burn out factor...

You can even diversify across asset classes - think MF, self-storage, mobile home parks, office space, etc - AND geographic location.One limiting factor though is whether you are accredited or not.

Will depend on several factors like the type of property, type of tenants, your risk tolerance, other assets you own, your estate planning, laws where the property is located, etc.Any lawsuits would be limited to the assets of the LLC and not your personal assets (assuming you run the LLC appropriately and the corporate veil is not pierced).

Quite a few more factors than you're figuring in your numbers.

It's hard to stand out.There are some owner-occupied segments with people who share motivating factors for selling their home.Seniors with Long-time Ownership: often ready to downsize or transition to assistance.Homeowners with Low Financial Stability Scores (FSS): Struggling financially and likely ready to cash in on their asset.Both these categories have additional advantages in that they probably don’t haven’t been updated and may have deferred maintenance.

The most important factor is finding a good company to partner with in a strong market.

If I had BRRRR'ed with the same money I could have bought additional properties I know but free time was, and is, a factor and I can always refi it out if I choose to.