Are you missing out on the Real Indian Market?
With less than 13% of Indians being English-speakers (Source: Wikipedia), if your website, app or content is not available in different Indian languages, you surely are missing out on a much wider audience.
Users, in general, feel more comfortable and stay longer and are more likely to buy from websites with content in their own language.
But the tough question is, India, being a multi-cultural, multi-lingual country, which language and what dialect should you choose to reach the target audience. Statistically, translation in top 10 Indian languages would help you reach out to more than 85% of the Indian population.
But depending on your target market, the choice of appropriate language combination and dialect might differ.