Do note buyers commit to purchase before note is seasoned?

[Ty Hines]

In my short time learning about notes I have learned that most note buyers who say they can purchase notes at closing actually can NOT. With that being said, is it common practice for note buyers to commit to buying a particular note while waiting for it to mature?

Of course with the note being structured and recorded correctly with favorable terms.Not speaking of a monetary commitment but more of a written one.