It's crucial to see a sample of houses to calibrate for yourself how accurate the estimates are.

Above, is a reference to learning and getting calibrated to know a good real estate acquisition when you see it!

My inspiration after contacting 100 potential investors to create my Dream 25 List is now stemming from all the "Sure, I'll invest with you" a few months back to *ring ring ring* *voicemail* aka *crickets*.The thing about disappointment as an entrepreneur is that you can re-calibrate and go at it again..It's so easy to be discouraged, it's so easy to throw in the towel, it's so easy to convince yourself that this may not be your strong suit.. 

Since I consider the calibre of a tenant that does not have a bank account as being of lower quality I assume they will not be reliable with paying rent on time.

Ask calibrated questions - What makes you ask?

We’re pretty happy with what we have in the 10 & 12 yr old cars, and renting a nice apartment.I just assumed I should take a moment to re-calibrate our investment strategy and look at other options.

For instance I know they are a calibration tool for estimating the value of a property or lease, but do people use them for other reasons?

You and @John Leavelle mention having a $200 minimum cash flow, so I may have to re-calibrate my approach. 

The game changes drastically every 2-3 and you need to calibrate accordingly.

I have never heard of price-to-rent approach used either.I know this isn't the answer you want, but based on the information provided, it sounds like your property has not doubled in value, so I would calibrate your expectations as far as the cash out amount.