For example, I found a home in an ok neighborhood that cash flows at 300 dollars a month with an ROI of 30%; however, would slight foundation issues (which are really common in my area on 99% of housing here) scare you away?

When leasing commercial real estate for terms longer then 1 year you will typically see rent escalation clauses throughout the lease contract If such a clause (or similar) exists on the lease agreement may be able to increase the rent without any advance notice.Here are some of the most common:1.

It's almost impossible to find a lender that will do 100% financing, but 95% of purchase and 100% of rehab on flips is pretty common; 80-85% for rentals is also very common. 

Regarding insurance: yes, the HOA carries insurance, but that's just for the common areas, outside damage, etc.

Many net less, but $50,000-$70,000 net is pretty common for an average sized, well-run, and unleveraged laundromat.

Mini splits are very expensive for the potential return on investment.Space heaters and window AC units are very common around here.

In my local market MFH are pretty expensive because they are not as common and are a bit older.

One common way to use an FHA is to purchase a multi unit property 4 or less and live in one and rent the others. 

PS: This is pretty common with front-loaders, especially if the previous tenants left the door closed all the time.

It may be the most common professional background I meet (among non-pure play real estate folks).