The amount of money that a screenplay can sell for can vary significantly depending on a number of factors, including the specific genre and subject matter of the screenplay, the demand for scripts in that genre, and the specific terms of the sales agreement.
In general, screenplays are sold through a process called "optioning," in which a producer or studio pays a fee to the screenwriter to acquire the exclusive right to produce the screenplay as a film or television show. The length of the option period, the amount of the option fee, and any additional payments that may be made to the screenwriter are typically negotiated as part of the option agreement.
The amount of money that a screenwriter can earn from the sale of a screenplay will depend on a number of factors, including the popularity of the screenwriter, the quality of the script, and the budget of the film or television show that is being produced. Some screenplays are able to sell for millions of dollars, while others may only sell for a few thousand dollars or nothing at all.
It's important to note that the film and television industry is highly competitive, and it can be difficult for screenwriters to sell their work. In order to maximize the chances of selling a screenplay, it's important to consistently write high-quality scripts, build a strong online presence, and identify potential buyers or agents who can help to represent your work.