It is not quite a membership model and is more of a pay as you use. He wants to keep the cost of accessing the premium content relatively small.
Say he teams with 10 different experts and creates 10 different premium pieces of content at a price of $1 each.
Is there a way the sales process can be set up so that for every sale that is made 90 cents goes to the corresponding expert and 5 cents goes to my client and the remaining would be the fee.
Consider this similar to the Fiverr model, which takes a small portion of every transaction.