(Williams in Greensboro was only charging me for the trip fee but I elected for preventive service since they were out there anyway.I'll pay more attention to my unit air returns in the future. 

Quote from @Elisa Lisa p: Thank you Greg, the neighbore upstair has avoid 3 times in past 10 years to my ceiling, I really think is his responsibility that his radiator leaks.should I just take the neighbore to court and not get HOA involved.Since the leak is going through a common area and they have made no effort to prevent this, I'd include them.

However, large volume wholesale companies of which I'm aware tend to have non-compete agreements that you must sign, which would "prevent" you from going into business for yourself (or with a competitor) for some period of time and/or within the same territory.

I.E. do exactly what they are trying to prevent. 

Plus there is so much competition from tons of people trying to get into wholesaling, not to mention the big players already getting the lions share.

How will you prevent that from happening again?

After a couple deals you do like that with a key player, tell them that from now on, you would like to manage the project yourself.

Without the resources to spend the money and time to find off market deals, do proper due diligence, and to fix the problems that will come from "deals" that likely have issues preventing them from going to market, it's an uphill battle for most.

Also on a different note , I think there are safeguards in place to prevent such behavior .

A lawsuit can run a year and a half and cost between $25,000 - $50,000 with no guarantee of the outcome The other side will likely file a “lis pendens” which effectively prevents you from selling the property or borrowing against it until the lawsuit is over.