I appreciate the responses from both of you guys.

@Evan Polaski Evan, first of all, thank you for a very detailed response! 

I reduced my responsibility to only taxes/insurance while the tenant buyer does the maintenance, pays utilities and makes monthly payments to me. 

Responses like this are good for me because I am pretty uneducated on things like specific loans or qualifying requirements.

Know your responsibilities as a landlord instead of acquiescing to every request or complaint.

I would also explain that if it happens again that they may be responsible for some or all of the cost.

Appreciate the response and useful information!  

Even if they don't realize how much money you're costing them now, someone will tell them eventually and I don't think your canned wholesaling response is going to do much to repair the damage. 

To qualify for active status on short-term rentals for tax purposes , you need to meet the IRS’s material participation requirements.

Thanks @Kerry Baird for quick response.