That could be a great idea however, the highest paid CPA offer require more than a fresh IP adress, you will need phone number, SSN sometimes in other word a complete new identity and sometimes you will have to buy something ,like shipping and handling fees, or at least give some Credit Card info. So I don't know how you will make up all those informations with no additionnal costs. If you do know a way to do it for free or for very cheap then you idea will be doable and profitable I believe.