When I first started I still posted DEALS around the net, but quickly or not so quickly learned to stop that behavior.

We as a community tend to let things go because it "isn't worth the hassle" but this attitude is often responsible for the continuation of this kind of behavior and you would be providing a valuable community service. 

Hopefully they have cars and phones and clothes they can't afford like normal renters and will correct their consumeristic behavior, allowing them to qualify within 24 months.

The problem is, when you encounter the typical, what I call the "Susan Rottencrotch" realtor, most of the time the sellers have no idea about the behavior of their listing agent until they are exposed.This why when I'm helping one of my borrowers, who I have referred to my realtor partners, I like to preemptive strike the listing agent with an:Attorney Escrow Letter Approval Letter  (when possible, a lot higher than the list price)  This accomplished a lot of things, but mostly lets the listing agent know my borrower means business and can easily purchase the property and also the listing agent is then in receipt of the letters.Then if I need the listing agent to open and show their own listing, its hard for them to say no.  

That probably won't work but it's worth a shot.If his tenants are scaring off your tenants, you could threaten to sue him for the loss of income due to his tenants' behavior.

I am a behavioral therapist currently located in Southern California, SGV.

Some of his behavior is absolutely illegal and I would never recommend anyone follow his lead, but it's worked for him.

However, as this was a new tenant and the behavior is not acceptable I knew that I needed them to hear my voice and be put on the spot.

Be courteous and helpful but explain you will not tolerate late rent or bad behavior and you will be golden.

Overall, if you've found a good tenant, keep them as long as you're able to, and no need to worry about a sudden switch in behavior!