the problem is the cpa networks will pull the offer when the advertiser sees that it is not backing out, zip submits and email submits need to back out to certain member value, let's say they pay $1.25 per email submit, after the users goes throuhg the incentive path, they need to generate more than $1.25, if you are below that amount, and you will be if you are using the above method, the cpa network will ask you to stop sending traffic,