Like I had some moral obligation to accommodate a buyer who couldn’t fulfill the contract.  

I have experience and have enjoyed being a part of the world, but more importantly I want to be financially free so my family can take advantage of opportunities I had to pass on growing up due to money constraints, to have the ability to travel because I hate feeling stuck in one place, and to have time to spend with the people I love doing things I find meaningful and fulfilling.

Another thing to consider, the Listing Agent was hired by the Seller, who do you think they will have a primary fiduciary duty to fulfill?

It is fraud for them to take that "money for keys" arrangement with no intention of fulfilling their end of the agreement.That may help to change their minds about playing you.

BTW, that's "Fraud in the Inducement" - convincing another to enter into a contract, when you don't have both the means (money$$$) or intent (you intend to assign) to fulfill.

What percentage of signed leases fulfill their full term?

Your lease may make it their responsibility, but ensuring they fulfill that responsibility is your responsibility. 

. #3 proactively network to people, it's kind of hard starting out because you have very little value to give but as you learn and expand your network, so does your capability to fulfill other's needs or to create a new need (an opportunity) and fulfill it for them. 

Even though I'm not a religious guy, I feel like I need some form of spiritual fulfillment if that makes any sense.

We are also currently working on writing our first lease agreement, our question is if we include all of the tenant's children/relatives etc... age 18 and older that will be living in the home on the lease and if the mother or father leaves, moves out, etc... will all of the remaining adults on the lease be fully and legally responsible to fulfill the remaining months on the lease?