Consumer mobile applications business myth

Who should own up revenue responsibility in consumer mobile applications business? Marketing or Product Management?

Unlike any other industries, product sampling (free trial period) is de facto in consumer mobile application business. Consumers can try the product / service first and then pay for it if they like it. Marketing dept. drive consumers to download the product (trial version) through various communication modes. The free download to sales conversion happens only if the product is good / delivers value.

If so, who should own up the responsibility of sales? Marketing or Product Management?

I believe that it should be latter as the product itself does the sales function. What do you think?