Why oh why do you have to pay first to use paypal?

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So I know someone told me this before but I just kind of overlooked it as a joke. Apparently in Thinkbux & crewbux which i've been working on so hard to reach payout to prove to people that they're in fact a legitimate program, the only way to ever get payouts to paypal is to become a premium member which requires you pay with Alertpay cash. I almost 100% believe Alertpay is a scam so I refuse to join them, however. There is no other option, so with this I say. Goodbye Crewbux, Thinkbux, and any other sites that do this that i'm a part of. Even if they do pay their members this is very shifty & as far as i'm concerned, unexplainable behaviour & isn't worth my time. I'm going to report those two sites to many many people and many many sites unless someone can explain to me why oh why you have to pay through Alertpay to get a premium membership so you can receive payments in Paypal at a later date? If they're willing to remove this ridiculous feature from their site that would be nice to know, if not. Tsk Tsk. Yet another few scam sites passing off as legitimate sites.