Title managers are a great resource for market players. 

If I do change the locks, will I still have to rekey them to prevent having three sets of keys? 

In a market that is active you will have 5 to 10 players that will buy 90% of anything that comes up that is remotely a deal..

Note good does not necessarily mean cheap   Look at helix hospitality.Amazon sells mattress and box spring wraps that prevent bed bugs getting into the mattress/box spring.  

does having a contract with a listing agent prevent you from buying properties ... directly from owners?

.: Quote from @Marcus Auerbach: My point was: the law was intended to prevent this practice.

If you called the lender that did the original loan they may just be trying to prevent themselves from getting portion of commission recaptured from an early payoff.

That will prevent them from qualifying for other rentals, a personal loan, or a home loan.I have sent nearly 60 tenants to collections.

We excel under current market conditions – the same ones that have many people panicking, as several of the major players in the real estate fund space are reporting losses, forced sales, foreclosures, and SEC investigations.

I am assuming the answer is "yes" to get credit card points and prevent a contractor from charging a premium on materials.