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The minute that Visa and Mastercard provide a place to sell your stuff and a fulfillment model that will be a useful comparison.

I haven't looked in to MasterCard's market place close enough, http://www.marketplace.mastercard.com/

It's basically a discount code site with click through links for Mastercard holders. It's closer to a loyalty program than it is to iTunes.

Apple is already richly compensated for the additional value that their platform provides. The minute you understand that you will be a useful troll.