I've had such bad experiences in the past with dogs in a different fully furnished short term rental where we originally allowed dogs-- swimming in a decorative pond and disconnecting the filter, killing the koi, chewing up a couch and other soft furnishings, scratching a newly installed hardwood door and ruining the finish, digging giant holes in the yard and landscaping.... thousands of dollars of damage, really, in a very short time, which is why I have a strict no pets policy, and am particularly nervous about dogs on the property.

This sort of ruins the appeal if you have more funds you want to safely earn interest on. 

There is no sense in ruining goodwill over a trivial issue.

So it is calculating the profit using increased rates for cash flow that has not come in yet.It's a relatively minor issue, honestly for estimating purposes, most people are probably not going to find this ruining their deals, but I'm a bit obsessive with getting numbers right and this sent me down a rabbit hole tonight figuring it out. 

He apparenlty is lying to us and he apparently has ruined them.

It is the way of the world now, that some will ruin it for the rest.

Basically it can ruin the character of the area. 

All things that could ruin friendships.

If you live in an area with hard water it will ruin the door if not cleaned frequently.

I suspect many many folks have tried this and ended up in bankruptcy and basically ruined their credit life for a decade... so like U said one must be very very cautious with this approach....