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What should I do?
Create an info page on a similar topic with affiliate banners or find a product to sell that's related to those terms?
Also, the service is low cost but I can make $100 per sale so my closing ratio doesn't have to be that high to make money unless I'm missing something...
If the terms are not competitive in Overture, it's possible that few are going after them in the regular SEs either. Try optimizing a few pages for those terms, place your affiliate links strategically, and see what happens. You might have happened on to something that could be delightful indeed!