Most of the offers now a days you have to pay more then just shipping and a lot of the offers are e-mail/zip submits. Which doesn't have nearly as high a payout as some other offers. So the business model is a lot different. How you going to give an ipod away when all you have zip submits and surveys that pay $1? The user would have to do 100's of them. And for the most part people are impatient. When before when the offers were good you could do about 2-10 offers and get an ipod. (depending on the site if it was referral based or not) But there was way too much fraud in the incentive industry that advertisers said fuck it.
I've not looked at it from the webmaster/site owner side of things only as an affiliate, but that can't work.. half the zip submits are for the same sort of sites...
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PF' glad to hear you aren't one of the cowboys, sorry if I sounded like I was havin' a go. Take it you've covered your arse (or ass) legally regarding selling the sites. Some sort of disclaimer on the shit no-one reads when they join? As I'm sure if a new owner doesn't deliver to your members then you could be in the shit as much as them.