"It is a numbers game" http://gigaom.com/2010/03/26/case-studies-in-freemium-pandora-dropbox-evernote-automattic-and-mailchimp/ http://gigaom.com/2010/03/26/cas

"It is a numbers game" http://gigaom.com/2010/03/26/case-studies-in-freemium-pandora-dropbox-evernote-automattic-and-mailchimp/ http://gigaom.com/2010/03/26/case-studies-in-freemium-pandor... http://eu.techcrunch.com/2010/04/19/babbel-turns-a-profit-after-dumping-freemium-model/ http://eu.techcrunch.com/2010/04/19/babbel-turns-a-profit-af...