I have to say b8a's point on the app store is a good one.
If sony and nintendo (let focus on sony here though) opened up PSN to allow user submitted content and took a slice of the selling fee, they would gain substantially from it.
For one, it would take out a lot of the need for "hacking" the console, and it would also allow free titles to be released into PSN if the developer didn't want to charge for their software.
Will this ever happen though? Probably not.
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