Mwarden: That is a very nice detailed explanation / formula. Well written.
Being a newbie myself, where do people find these "deals" that allow these formulas to "work"?
Everyone on these board advocates putting as little down as possible. Doing this requires taking out a larger mortgage (it also means you now have to pay PMI). A larger mortgage requires you to ask for higher rent in order to satisfy the cash flow requirement outlined above.
As you said, the market dictates the rent, not the property owner. I've looked at properties from whole sellers, etc and haven't found anything close to fitting this formula. I'm beginning to think that the Phoenix market is not for REI, or I just don't get this "business". I'm having a real hard time believing that I'm the only one that can't find a $150k SFH, where I can put down 10k, and have a $1000 / month mortgage. Then rent the home out for $1700 just to cash flow $150 / month.
This is just not happening anywhere I know of.
EDIT: A $150k home in Phoenix is in a slum and sure wouldn't command a 1700 monthly rent. And if you could score a $250k home for $150k by some stroke of genius, you would be damn lucky if you could get 1700 in rent.