After thinking about this for a while, I just don't get it. It may be very obvious and I could be having one of these 'doh' moments. But why do CPA companies have these one field submits? E-mail submits, ZIP submits, etc. What do they gain from these kind of one field submits? I know they should be getting a targetted opt-in list with email adresses on email submits, but how about zip submits? I know people are supposed to go through with it and fill in a whole load of personal information after they submit their mail/zip, but isn't the rate who doesn't do this pretty high even on legit targeted traffic? And affiliates are already payed after that submit. It just seems like obvious bait to catch cheaters with. Hope someone can give me a little more insight on this.