Paid: $26.42 USD
Impressions: 28,317
Views: 252
Favorites: 47
Orders: 1
Revenue: $30.00 USD
These are my stats. I've used it a few times, and haven't discovered any real trick. Views just seem to be low for it. One thing I have done is choose specific items in my shop that are popular and more likely to get views, but didn't notice a difference. Also, like you said, it's important to edit search words to the most relevant terms.
Would love some advice too!