What does TV play make money from?

TV plays are mainly sold to one TV station, and each episode is more or less. The TV station can't determine its ratings until it buys the drama. We can only speculate through a series of factors such as the director, starring role and screenwriter of the play, and finally give a reasonable price. In fact, the value of someone in the circle is probably marked. If the ratings are high when it is broadcast, then the TV station will insert advertisements. This time is only the profit of the TV station, which has nothing to do with the original crew. It's just that this crew will gain a good reputation and help them find better investors. The next movie will be robbed and sold at a good price.