You buy traffic at adwords? Arbitrage is a hard thing to do and keyword prices changes each day. How many work does it take for you if you create 50+ niches pages a day? How do you manage it to make sure you don't pay for traffic more than you spend buying it?
Not from adwords atleast not with arbitrage. Automate the niche creation, scrape the content, run keywords through variation tools to create 10,000's keywords for your niche's. The only thing you may have to do by hand is the adgroup setup in your advertiser campaign. And arbitrage isnt really that hard, its such a simple concept and only requires research. It will also gain you skills to use in affiliate marketing for a larger ROI.
They allow you to track which sites/positions people clicked on the adverts and how many times...its good when monetizing your site.