Perhaps some unexpected context: at least some authors of long-form pieces write with the objective of selling the rights to their works in mind. The more it feels like a screenplay, the more likely it is to attract a buyer who feels it has potential as one.
I don't have numbers from you, just that bit of context and some supporting quotes off the record.
Qualification: I tech-consult producers and writers on screenplays.
You probably know this but others might not: there are literally agencies that develop ideas through a tight lifecycle of inception, moderate form to long form market testing in publications like Wired and investment and film/podcast/TV development sourcing based on feedback from those market tests and brand sponsorship and alignment for the launch of the final product.
I don't have numbers from you, just that bit of context and some supporting quotes off the record.
Qualification: I tech-consult producers and writers on screenplays.