Unfortunately you are SCRAPPING your text content, this is against Googles Adwords Polices. (Text is also copywritted just as multimedia formats such as videos, lyrics, music etc)
Google manually reviews it ad-word accounts holders, you even need to apply for the acount first and then they are put on probation.
Similar to Google Rankings they work on trust rankings which means the less trust you have the more likely your be subject to a manual review and that's if they don't catch you from their automated bots which in all honesty they will, just take a look at good at Google's Panda was at catching sites with Thin and Duplicate content, they can easily use this technology on all of their systems for alerts.
As harsh as this may sound - stop with the duplicate content. The money you are willing to invest in buying traffic can be used on content writers that will put you back in Good status with Google, Gain Network Traffic, Earn Money from Visitors easier, and most all of your long term online survivability will be greater.
PS. You can get someone to write a 500 worded Document from $5-10 each, a adword lick could cost you $1-5 depending on the keywords, I know where I would want to invest my money.
People on Fiverr normally charge around $5 for each 500 words, ensure that they are not SPINNING content and some are better at grammar than others. You could always use your documents with a Proof Reader and have them correct the grammar issues, again these are cheap and normally $5-10 per 1000-2000 words.
Think long term and actually make a site that will gain natural visitors without the need of buying traffic.. Buying traffic should be used to boost the amount of visitors, not give you visitors.