I'm a free member of some PTC sites and I'm receiving the same ads every day

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I'm working with some PTC sites like Neobux, auro-bux, etc. as a free member. I haven't upgraded my membership but I found that I'm getting the same ads everyday. They are not changing their ads but everyday after I click the same ads, my balance is increasing. Their ads are also about their site only e.g. about their recent payments, about the testimonials, about their forum, about their premium members, etc. so I doubt whether these sites will pay me if I continue to be a free member and I reach minimum payout. I know anway it's going to take 6 months to 1 year to reach minimum payout because they pay only 0.1 per click.