clixsense: how to upgrade account???

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I have almost reached my second payment at clixsense and I am planning on upgrading my account. So I went to read their FAQ and here is what I found and don't understand: Can I use my earnings to upgrade my account status to Premium? No. Premium account status indicates to advertisers that the viewer has successfully made a purchase using a credit card or bank account online. Most advertisers prefer to show their ads to only those who have proven buying power. So if I can't use my earnings to upgrade to premium what is the way to do it? Are there any clixsense upgraded members here on mylot and could you please explain how you did it? Thank you very much.