What would prevent them from getting you on the hook, and then having a phantom offer arrive in order to drive your current offer up?  

The best system to prevent this would be to throw every non paying tenant into debtors prison. 

We like to offer wide access to our units, to help drive interest and to prevent discrimination claims.We use a scoring system to objectively rate the applications and choose the best fit for us.Some things to consider: https://www.biggerpockets.com/blogs/4445/44420-ten...

Fortunately our tenants have been paying but if they were to stop paying we would be notified which would prevent many months going by without us being aware of a problem.

Funny how growing up in a place all your life, can prevent you from noticing all the change going on. 

Also has anyone had the Lack of a W-2 Income prevented the Refi.

Preventive maintenance, strong tenant screening, and good management will produce the most predictable outcomes.

Having said that there is nothing that prevents you from wholesaling a property if you are not miss-representing what you are doing and making false promises to the seller.

How I do it is keep the water/gas bills in my name (for exactly why you do to prevent liens), but build into the lease that tenants are responsible for the bill.

If there is a component missing (fixture) there really will not be a good way to test the system unless you can shut off the supply line to it and prevent the air from escaping there.