How to make some money

Make a list of all three-letter sequences.  Divide them into two groups - those which you could imagine someone writing a clue for in a crossword puzzle, and those which you can't think of any way to get them into a crossword puzzle.

Then, using letter frequency of the ones that fit, find the one that can't fit which is closest to fitting.  This would be based on letter frequency and position.

Then, make a movie called that most popular not-yet-existing 3 letter word.

After your movie goes on video, whenever crossword puzzle makers need that 3 letter combination, your movie will be the only possible clue for them to use.  Over the years, your movie will enter popular consciousness.  I predict your sales could rise by as much as 5% from this tactic.