Scam Alert! Is this site a scam?

Since the advent of the internet, many so-called internet marketers and advertising agencies which seem credible at first end up being scams. I stumbled on this site that has given nigerians a really cool way to make money. Although they don't collect any cash from you, I still have my doubts. I tried investigating it but didn't make any head way. Here's the site: Paynize.com Earn Money by referral links advertisement They have a really good payment system and you can make a lot of money if you know how.Check it out and tell me what you think.