If you had a tool that would be capable of writing all software better than a human, why would you price it by the word (token)? Why wouldn’t you take a percent

If you had a tool that would be capable of writing all software better than a human, why would you price it by the word (token)? Why wouldn’t you take a percentage? (This is one of the more interesting questions that came out of Alex Karp’s televised borderline psychotic break rant the other day and it has stuck in my mind even though he is clearly unstable)