| http://www.w3.org/ns/prov#value | - There might be a few good apps that generate decent revenue, but those tend to be rare apps that appeal to a large audience and become instant hits, such as Angry Birds. ??? The cost of advertising a cheaply-priced app is usually higher than the revenue the ad campaign generates. ??? Relative to the desktop market, the portable device market is still small and more difficult to target. ??? App dev
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