This hole is one of the old sewer lines, before it was combined.

Examples: I take a refundable pet deposit instead of a non-refundable one or a monthly fee, I currently pay the whole water bill without taking money from tenants because the duplex is watered together (I will eventually get a separate meter but the outlay is more than I want to pay right now) assuming it doesn't get out of control, paid for the new doorknobs on the bedrooms because the tenants requested locks despite the lead tenant saying they would pay for it, planning to replace the microwave hood simply because it's louder than it should be though it still works, etc.I'm probably losing out on a minimum of $100 monthly.

A tax deduction is simply a discount on what you have to spend.

I can't tell you how many times I've had to help an investor did out of a hole because they wrote a cash offer and didn't mention that they wanted financing.

I interviewed with a KW brokerage near me and felt that they offered a great training program but it simply wouldn't work with my schedule. 

I'm not asking for free work, but simply a reliable contractor.

Contractor put a small hole in the roof and it took me 3 months to get $200 back from him.

Therefore, simply quoting a general expense ratio is not the correct approach. 

I don't understand how some wholesalers can spend thousands on marketing, guru courses, etc. but won't simply get a real estate license. 

"offered to let me leverage his FHA"I am no legal expert, but this sounds like one of two things: 1) tip-toeing around the edges of mortgage fraud or 2) simply a bad idea.