I had a guy who was under contract to buy a property from me who kept disappearing and his dragging his feet cost me $.

I've had lightbulbs, custom cut blinds, and a hanging microwave disappear though, and on each of those cases I had a security deposit to deduct from.

Even in a hot market people will disappear on you.

Last year this abruptly ended and all of our bins were collected by the city.

They are most likely to disappear with your money, take longer than projected, cost more than they estimated, or do poor work.

Also, unless the buyer/tenant puts up a significant down payment, if they disappear after a year or two, you could still be left paying for repairs and updates for the next tenant/buyer -- which could eat up any profits you collected in the meantime. 

BUT, the proof is in the numbers, as high paying blue collar jobs have disappeared in the last 40 years, the gap between the earnings of those with extensive education and those with limited education is HUGE and growing.  

Promise I won't disappear again....

You pass on enough maintenance costs like this to your tenants in the interest of saving your time and money, you'll be posting about how your mean and cruel tenants unloaded fifty pounds of concrete down your stack just before they disappeared in the middle of the night and you're now stuck with a 10 grand bill to run a new line in, how could they possibly be so cruel and mean to you?

He helped get pictures ready for the listing, and was always happy to clean up and disappear when I needed to show the place.