The real wonder will be if this formula (here) I purchased from Home Depot will knock out the stump afterward.I got 4 of them just in case one doesn't do the trick.

I'll try the food coloring trick in the toilet, thanks.

For example, when they don't pay their rent, you can't always just send them a letter and expect that to do the trick.  

In other words, don't play tricks with your own mind!

I know they have this model already working for Real Estate in places like NYC, so it is theoretically possible for existing buildings, the trick is organizing it for new developments as described above.

The trick is explaining it and the benefits to the customer.      

Thanks for the mention @Troy Fisher.I'm just a bread and butter landlord and don't know much about the vacation rental space.Chelan would scare me a little because it is a one trick pony to me.  

Even if I asked them to explain their efforts to me, they could easily trick me into thinking they're doing a lot more work than they are.

How much would you pay to learn the trick of the trade?  

The trick is dealing with an honest realtor who is looking for your best interest in the long run.