Is it worth to upgrade in Klickbuck?

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Well, actually i am not active in those site anymore since a month ago but for my surprise when i checked back yesterday i saw my earning still accumulating (from my referrals) which means there is still an advertisements to click on. Then i requested for cashout yesterday and i received my payment today, it means they still paying and legit, isn't. So, i am planning to upgrade to unlock 2nd and 3rd level referrals because i have about 200 refs in level 2 and 3 combined since i am not earning from those levels. How do you think, will it worth upgrading for 25$. Are you still clicking there?.