Reapeated clickers...advertising in the PTC sites..

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In the recent days,almost in all of the PTC sites we are able to see some four ads..months together without any change.As the members of the ptc sites, we are also just making clicks in such ads without considering the content of the ads..Same ads..same visitors. Even if one or two ads are changed, we are clicking still without knowing the change..By advertising in such sites, what the advertisers are getting? Do you think that they will get some benefits in such advertisements? I think there will not be any use in advertising in such sites..I have never purchased anything from such visits so far.But I used to click everyday all those ads without fail and I know well that the cost they are spending for my clicks are just waste..I do think this is same for all expect few exceptions..These exceptions much less when compared to the number of users who are clicking without purchasing anything..Have you dvertised anything in these sites and got any return?