Examples of pricing

• 2013.07.17 - iPhone v2.10.1 release notes
  
  • "As you know, we used to charge iPhone users a $.99 one time payment, while Android and other platforms had free service for the first year and paid $0.99 a year after that. From now on, we've simplified our business model so that all users on all platforms will enjoy their first year of WhatsApp service for free, and only pay $.99 per year after that. (...) The good news for all current iPhone users is that WhatsApp will be free of charge for the rest of your life."

• Offer a special, discounted “startup rate” on Stack Overflow Careers
  • Joel and Jeff both post a bunch of comments on this question.

The problem with approaching multiplayer games in this way tends to compound on itself. Because of those initial price barriers, games’ communities crawl out the gate small and emaciated. When new players decide to see what the (sadly minimal) fuss is about, they have trouble finding matches to play in—especially as time goes on, and especially against players of their own skill level. So, even curious newcomers don’t stick around long.