After someone has written something / produced a TV channel, sending it to one more person costs basically nothing.
So, if (making up some simple numbers) there are 100 writers who want paying $10 each, and 100 customers who want to pay $10 each, you can:
* Charge each customer $10 and let them read every writer (most of which they won't want)
* Charge each customer $1 a writer, then they get to read 10 writers.
* Charge each customer $10 a writer, then they get to read 1 writer.
People often say they want to pay a smaller amount for a subset of content, not realising that if everyone does that, you just end up spending the same amount as you started, on a subset of content.