300 clicks but no sales generated
That's statistically insignificant IMO assuming if you only got a 1% CTR, which happens, it would only be 3 clicks.
Depending on where the traffic is coming from they may never click your ads it they aren't in a shopping mood.
You need to target traffic from keywords that generates shoppers and clickers, not just surfers.
Additionally, ads can be valuable content. One site I run the ads are as equal to the content for the members. For instance a site about plumbers running ads from plumbers would be a situation where the ads carry nearly equal weight to the content and clicking skyrockets.
Sometimes the ads need to be creative for the page such as a related topic which the visitor may have overlooked, or DIY videos, etc.
Until you A/B test some ads, you won't have a clue what works, and with that low traffic it might take weeks or months to figure out the right formula of ads to content.