From a user experience perspective: It would be so much better to buy posters/mugs from the app where it was created than exporting it/putting it on some desktop then go to that website, or first search for it then register, oh no where did I put that file again, ah nevermind.
From a business perspective: Apple doesn't seem to ban apps that sell goods inapp: eBay. (Maybe both, but ) one of the sites mentioned above sells only on their website even though they let sellers create their own website. I guess this is to upsell by cross promotion ("continue shopping" message + similar products after the purchase).
Do you know any quality service that already offers this?
or, if any of you reading can do printing/delivery but needs devs we are more than happy to implement it :) (should you dislike fontify, think about printing photos =])
