We do our own PM, so I look at the difference in caliber of tenant and what I can charge and convert when considering "amenities," which I would not think of a ceiling fan as being one.

As you have already read, closing costs are similar to real estate as they are local in nature.You should be able to get pretty close if you can figure out what the % charges are for state, county, city, also if financed. 

I didn't see, but do you typically charge points and have a range for the interest rates?

They may move "up/down" in neighborhoods but their life skills are likely to remain the same.A tenant rating system(TRS) obviously can't be published so I can only see a TRS being used to vet applications and documented in your accept/deny documentation.So how / where do you see this being used?

Did you get any kind of application on these people from the Seller?

And you'll have to hang your license with a broker, who will probably limit your personal investment activities, not to mention charging you fees and splits.

After that, it will change with the current rates, upto a maximum of the payment for principle and interest shown on the estimate sheet.Your refi did not cost you anything, but those fees got paid by someone, likely it was rolled into the loan total or you were charged a slightly higher rate (in exchange for the lender paying the fees).  

In my area they charge a months rent for that service.

Just for clarity, typical charges from intuit look like this: "Withdrawal ...

This is the rate banks charge other banks to borrow money overnight.