The Letter Of Intent you accept will be the best deal you will ever get. Your selling memorandum, your recast financial statements, all your follow up communications with buyer and your tour of the facilities should all serve to justify your asking price. If the buyer has any objections or concerns about your asking price you want them to express them now rather than later.
However, a sample may be required in other formal organizations. For example, a school may require the letter during the formation of a new group or club. It is also important for students wishing to join certain colleges for they can write the letter to show which college they intend to join. Students applying for positions in certain schools can also write the letter as they apply.