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

I feel like the moral & ethical thing to do is always the most right by the most people. 

Unless your lease specifies that you use poison control and that any risk to a person's pet is their responsibility, I don't think you can ethically (and possibly legally) create a toxic situation for pets that you've allowed in your units. 

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

I am fairly personable and love the idea of having my pay being directly related by my work ethic.

It sounds like you have the knowledge and work ethic to sell this opportunity - keep pushing and your hard work will pay off.

I also consulted my profession’s code of ethics. 

If I chose to push it, he could not only lose the sale but he could be subject to an ethics violation.

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

If you hop on AirBNB and there are lots of places to rent way out in the future but few now (assuming there isn't a "busy season"), that could be a positive sign.18 acres isn't enough space to hunt on safely or ethically except maybe wingshooting or bow deer depending on location, so that's probably out...