Fred Wilson (Mit Union Square Ventures Investor bei Twitter, Delicious vor dem Verkauf an Yahoo, Tumblr, Zynga, Etsy und anderen) über kostenfreie Hauptkomponenten in Geschäftsmodellen:
Wikipedia, Craigslist, YouTube, Flickr, Instagram, Facebook, Twitter, Tumblr, WordPress, etc, etc. There is no value to any of these platforms if the users don’t create the content. The users create the service, curate it, and make it what it is. I do not believe it makes sense to charge users to create the value. We’ve seen folks try this model. Typepad (where this blog is hosted) charges to host a blog. How well did they do? Phanfare charged to host photos. How well did they do? The list could go on and on but I don’t want to focus on failed services.
When scale matters, when network effects matter, when your users are creating the content and the value, free is the business model of choice.