Fifty percent of iPhone developers have achieved peak popularity in the App Store for a free iPhone app. Twenty-eight percent have made the top 100 list for a paid app.

Tip: Understand how pricing will affect your demand. Offering a mobile app for free can rapidly grow your user base; however, to sustain your business you must have a source of revenue. Charging for your app is one option, other options include: ad supported, selling virtual goods for micro payments, and sponsorship. Run tests to optimize pricing.

Tip: Paid search is only one option. Because mobile advertising is experiencing slow adoption from major brands, much of the mobile ad inventory is affordable (think remnant). Also, once you have an application with a large user base, use cross promotion to introduce a new application. Cost effective tactics are PR, blogger outreach, social media, and the elusive viral marketing.