I used the bigger pockets calculator but can't get it to calculate the Cash on cash percentage.

A 10% cash on cash ROI could be slashed with a single percentage increase in interest rate.Secondly any mortgage laws, requirements, etc. that may change or negatively affect your property can be mitigated.

Now that, coupled with appreciation, might be a strategy in itself for high income individuals, but if that's not a large percentage of landlords, ...like I said, expect a sell wave at the smallest sign of economy trouble or appreciation slowdown.6.

Then, over time as I developed a track record, they started feeling more comfortable lending me a higher percentage of the purchase price. 

For a small percentage of the total rent, most companies are able to find you a tenant within the first month of contract.

If they choose to charge you, it should be prorated based on the percentage of area you are responsible for and based on the remaining life of the carpet.

You can start smaller (6 to 8 units)  and work your way up.Screening in a strict but responsible process that will help you with your occupancy rate percentage when it's done correctly.

Because most of the closing costs are fixed, the percentage can be extremely high on lower priced properties.

My opinion is that as long as that loan is making you a minimum return percentage after the debt payment is made. 

Put most of your 'profits' at first into contingency fund, then budget a percentage of monthly flow to keep that account growing.