It seems most cabins typically need something (or will), some you find during an inspection, others you hear from guests, and then you need to be prepared to repair it ASAP.

But as a FSBO, I would to make sure you are pricing your house accurately with comps, hire a professional photographer, pay to list your house on the local MLS to make sure the people you want see it, hire a real estate attorney, and prepare to deal with buyers.

In our observations it's because most tenants live in the moment and do NOT prepare for the future.

Make sure you do the things to get prepared to make it all work.

We are prepared to eat the cost and call it a loss but not without a tiny fight to show her that she can’t just do this to people.

Due to the age of properties here in New England this is always a risk if you aren't prepared to deal with the work or expense. 

However I did find that HRB charges a fee for every W-2, 1099, and P&L as well as any other form you gave them when preparing my taxes so what was once a $300 tax prep had turned into about $1700 the last year he did them.

Proof of Services.Be prepared to provide proof of the services performed and hours worked, especially if the IRS requests this information during an audit.6.

Essentially, how much equity should I be prepared to split with in investor in order to not bring additional cash to the deal?

To get that you need to be preparing the suit, getting the bond and filing the necessary pleadings for an emergency hearing during the same window of time that the recipient is thinking about how to hide or spend the money.