I find his behavior unprofessional and disrespectful, though apparently, not that uncommon.We'll keep looking and again, I thank everyone who has shared their thoughts and opinions.

Getting busy was a factor, BUT there was always time to find in between jobs and sleep that I coulda billed.It was weird when I stepped back to observe my own behavior.

No, it is never too late to change your behavior!

I think the most value is in behavioral economics.

They didn't hire him for any term....But based on his behavior, I could smell him a mile away so it was ME the seller that didn't want this older person to have to deal with a mosquito trying something in 6 months after the sale.  

And people are swarming like locusts to bid up the prices of anything that sounds like a wholesale deal.It just feels like behavior and terms that to me signal we are getting close to the top of the market.Nah.....I will pass and work with someone who isnt trying to create some sort of shark feeding frenzy for at best marginal deals.  

I would do monthly inspections until a clear pattern of responsible behavior is established, and keep new tenants on month to month (or even week to week) rental agreements. 

My key point, @Emily Allen is to address the humidity and tenant behavior yourself.  

OMG;  The following is judgmental of IMO deviant behavior in REIhope you are never displaced by a money grabber attempting to make a few bucks.  

@Aaron McGinnis is correct, "No job but mine" clause will not hold up in court, although you do not tell them what to do, but you are controlling their action by not allowing them to work for anyone else which makes them exclusive, that alone falls off under the behavioral common law under independent contractors.