Examples - owner occupied loans for house hackers, specific market knowledge (ie - friend of mine that ice fishes and bought a short term rental cabin in an ice fishing spot that you and I would never know of), ability to do renovation on your own or cheap, contacts with local companies or organizations that would be a tenant source for mid term rentals, ways to source off market deals, etc.Whatever it is, figure that out and get started.

Examples are self driving cars (that is going on what a decade?)

Typically, you have to keep enough margin for both you and the end buyer (assuming its an investor) to make money. 

In my case, at the end of their lease when I wanted to show the property to prospective long term tenants, the tenant gave me all kinds of grief about 'invading her privacy' and 'disrupting her life' even though I told her at the beginning of the lease that this was our procedure and I made every attempt to 1) give 48 hr lead times, when typically I would only give 24, and 2) blocked/scheduled showings for 1 day per week and 1 weekend day away from dinner time/church times, etc. maybe this was just the person I was dealing with though...- vet the tenant exactly as you would for a normal tenant.

For example, in NC the only dark blue areas are the largest counties in the state, even though Brunswick (Wilmington NC) and Pender Counties are growing faster as a percentage of population increase.

Landlord Rights Are Being Stripped Away—Why the Latest Examples of Squatting Should Concern YouThe media tends to side with tenants and take a negative view of landlords overall.

A mentor can help you avoid typical problems and offer advice, support, and insights as you negotiate your initial transactions.Assemble a trustworthy group of experts to support you during the wholesaling and subject-to transactions process, such as real estate brokers, lawyers, contractors, and bankers.Real estate investment may be difficult, and tenacity and determination are frequently necessary for success.

Andrew - I think you've accounted for a majority of your costs, but just a few others to consider include: vacancy factor (typically 5%), turn/over or releasing expenses, and property management fees (7-10%)  - whether you pay someone else or do that yourself you might want to include in your calculation.

An Appraiser's Client is typically a Lender.

Tenants are typically much less sophisticated than their landlord.