I too subscribed to a 'basic' membership, just because I was sceptical about the sustainability of the site, based on the members and the so called 'payouts' they have made. If what is correct on thier website, they are paying out more than they are bringing in. This website is designed to coerce surfers to buy thier 'premium' membership with no intention of paying out. Notice the names on the list. That should give you an idea.
If you are looking for a real PTC that does payout, even though it takes a bit more work (which is normal for a PTC), please go to ClixSense. They are reputable and they make regular payouts for basic and upgraded members, plust they will advertize your websites like a traffic exchange or safelist site. go to http://www.clixsense.com/?3696065 and sign up for a FREE account.