Generally, in agreements and contracts, they contain many clauses and small prints. Most people do not and will not go to the extend of scrutinizing the details.
This is due to our conscious mind wanting to avoid being overwhelmed. In some occasions, they may read the clause but would only give up halfway through. Why is that so? They back up because their mind is confused!
Our brain works in such a way that when it is met with confusion, the first tendency is to escape from it. That is why the conscious mind escapes and the subconscious mind automatically takes over. It does not need to be told to do so.
This is hypnosis.