If you have a startup that is useful for the masses and is equally successful, monetizing it is no harm. Babbel, the language learning site is all set to release its first premium product by tomorrow. The service would have you pay for a course that may last for as much as three months with a 20 day money back guarantee. Other features like, training exercises, etc would remain free to use for the time being at least. One will have to see how it affects Babbel, that currently boasts 250,000 registered users.
