Stay out of their personal life.

This applies in most areas of life, but if someone is simply agreeing with you, dropping PM fees down a percentage or offering discounts up front and sounds a bit desperate, they could be experiencing high turnover and poor customer retention.

It also depends on what else you have going on in your life.

Life is crazy.

If the software is not simplifying your life or making you more accurate, you shouldn't use it.

Scott Trench discusses this option in his book, Set For Life.

Depreciation also is a huge benefit that you can keep going as long as you are investing in real estate.There's always ways to make your life easier without paying those pesky taxes.

Then what happens on paper a property looks like a cash flows very well, then when you add in vacancies repairs and life in general, they end up having to start using credit cards to pay for things and get caught into that spiral To answer your original question most real estate investors are not buying a property every year.

Earlier in my life I only did 2-4 unit buildings, they always had rates fixed for 30 years, never had to think about impending rate resets.     

They can be friendly and helpful or they can make your life miserable.