I am in the early stages of planning an online business which will bring together those who want X, and those who can provide X.
Looking at Apple's App store model and Amazon's Publisher model, they each charge a hefty percentage of a sale, no doubt to cover the cost of running the system, and also to cover payment processing fees.
Would it be sensible to follow this model?
I don't know what makes more sense, to charge for example 20% plus processing fee, or something like 30% flat fee.