Which PTC sites are worth to upgrade on?

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I am wondering if most members of PTC sites who earn easily and fast upgrades their membership account...I am bothered with the slow earning process of PTC sites that is why I wanted to know if upgrading the membership account is worth it for me to earn faster and easily since having an upgrade account makes ads more available to them. For example in clixsense, it states a certain number of ads available for Premium members. Just this moment, there are "502" premium only ads which is hundreds more than being a free member. Lucky enough if you could click 10 ads a day. [b]My question is, Is it worth it to make an upgrade account on PTC sites? Which PTC site are worth it to upgrade on? To all who have made an upgrade, please share your opinions!!![/b]