However, I will say, BP seems to be moving away from it's founding principles.  

The principle is the same. 

I’ve never had to resort to cash for keys, and never will based on principle alone.

Any advice on what systems/principles work best?

In principle, I don't recommend borrowing up to 90% of its value all the time, just because your equity will sometimes become greater than 10%.

These are professionals with additional training and a stricter code of ethics.

That would include not only what you put in your pocket but also mortgage pay-down (principle). 2.

No one arguing for rent control, rent stabilization, or "just cause" nonsense understands basic economic concepts, and holds beliefs that are fundamentally opposed to the principles of liberty and freedom, upon which the US was founded.It would be great if we could just laugh along with them at the joke, but their efforts and scare tactics are still getting implemented and causing long-term harm.  

I politely listen, sometimes offer that I am an Investor too, but hear my fair share of abuse that I need to lower the price, and should consider their Offer because there is no other agent and I can keep "both sides" - another ethics violation sigh ... 

These are professionals with additional training and a stricter code of ethics.