Disabled persons: When the parents of a disabled person have passed away, courts will rely on the family's letter of intent to try to figure out what the wishes of the family are for the disabled relative. A letter of intent is sometimes the glue that holds a potential deal together. While deals are done in the business world and other areas of life every day, usually the beginning of any deal was originally laid out in a letter of intent.
So, if a letter or document that nominally or presumably conveys the signer's "intent" or intention to buy, is essentially meaningless and worthless in legal terms, and is not binding on the signer or anyone, and CANNOT be enforced on him, then why would a respectable crude buyer, in the first place, want to waste its precious time and resources (or that of its expensive lawyers) to engage in such a fruitless exercise for the benefit of a seller? Especially for an unknown or obscure seller?