Here's a recent snap shot of a niche ive been running with adwords and clickbank. averages to about 60% in profit on the clickbank front end. because i build a list, i later upsell with a $2600 product. average profit per customer is $3000+++ adwords account bans are a pain. after running so many tests, avoid certain dubious niches, and work with the ones that adwords is happy with.