Appraisal (if the appraisal that your lender engages (the only one the lender will base your mortgage on) comes in less than the offer price, the seller can reduce his price to the appraised value and all continues on - or you can walk with the return of your escrow; if the seller won't budge and you still want to buy it, you would have to pay the difference between the offer price and appraisal at closing).3. 

If you do a good job you can either do more or bigger deal flow or reduce your cost of capital for a fixed size of deal flow. 

If I can reduce my monthly payments by $200/month, would it make sense to refinance?

Not sure how I would pay for a medical/car/house emergency immediately with gold or silver. 

I think it is a great way to reduce one of your largest monthly expenses, rent if not live rent free.You may be eligible for tax deductions that you were not entitled to before. 

This will reduce costs to minor park maintenance and taxes.

There are discount brokerages out there you can work with that offer reduced commissions but you get what you pay for as they say; working with these brokerages will limit the number of properties you get access to because the traditional brokerages don’t like working with them.

Overall costs need to be reduced by $8k for me to do it.

However the aesthetics of modular houses are more modern (sell easier) and the turn around time reduces carrying costs substantially.

Raise revenue or reduce operating expenses or both.You might run into explanation that seems circular - value is calculated based on cap rate but cap rate is calculated based on value, it's like watching a dog chasing its own tail over and over again ... at some point your brain will explode :-) As stated above, the breakdown in the logic is the fact that some people think they can alter and calculate cap rate, this is incorrect.