no ads for me in clixsense

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I have registered to clixsense (www.clixsense.com) since December 14 2008. Since the first time, I never get ads. Then I become inactive member but they always remind me to login in other to keep my membership there. I keep my membership buy obey their email. I login to my account every time they send me email. So, I still have account in clixsense although I don't have any money in myaccount. Last 5 days, one of mylot's member said that we have to fill our interest in profile page in other to get ads. I did it but till today I didn't get any ads. I know, clicxsense is paid site and I want to earn there. Since I fill my interest last 5 days, I always login to my account but the ads never shown to me. What should I do? Do I have to upgrade my membership even they never give me the ad?