as opposed to selling it through advertisements. Although, through advertising solely I should say.

而不是通过广告来卖。不过，我应当说只通过广告。

广告和价格的关系 - SpeakingMax英语口语达人

you can make a good product and then sell it using advertisements,

你可以生产好的产品然后通过广告把它卖出去，

广告和价格的关系 - SpeakingMax英语口语达人