Apple Users Spent $10 Billion on Apps in 2013 - Businessweek

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"Apple’s cut in 2013 was $3 billion, which puts it in the same neighborhood as the overall revenue of some notable tech companies, both those that sell software directly and those that rely on revenue from advertising. Salesforce.com (CRM) and Adobe (ADBE), for example, earned around $4 billion; Yahoo! (YHOO) earned closer to $5 billion.
What’s striking is that this money doesn’t mean much to Apple—it’s only about 1.5 percent of annual revenue. According to its latest regulatory filings, the company made $91 billion from iPhone sales in the 12 months ending in September. The App Store’s main purpose is just to drive those sales higher. Any money the company gets from it is gravy."

Apple Users Spent $10 Billion on Apps in 2013 - Businessweek