Drafting a contract for wholesale.

[Randall E Collins]

Initially I drafted a contract for a property, presented it to a title company. Problem is the end buyer backed out and afterwards and I was stuck with a contract with no end buyer for a couple of months. Now the property is under a new contract with a new end buyer and is in closing. My question is, why draft a contract until one locates a positive end buyer. What are the legalities in regards to drafting a contract that one is not able to fulfill. I understand most wholesalers draft a contract then look for a end buyer. WHY?