If you get to the point where your song is sung at every single English-speaking home at every birthday, you have effectively captured all the market. You canno

If you get to the point where your song is sung at every single English-speaking home at every birthday, you have effectively captured all the market. You cannot get more successful. You reached the end game, the top score, there is no more growth to be had. The oil well has dried up and the gold mine is empty. You are standing at the end of profit.