Why would you ever agree to commissioned job on conditions like that? I mean, if you'd arrange everything through CGT freelance system, you'd get paid 95% instead of 70-80%, client would prepaid money even before you start to work, so you'd be sure to get paid and it would be much harder for him to to get refund on false reason. You are much more protected when you're working through freelance system and you earn more, what's the logic to dismiss that?!