Are PTC sites paying to standard members?

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I've been in the PTC sites since June and until now I haven't received even a single dime. the problem is that when I reach minimum payout, the site will require an investment in order to receive payment. In other words, standard member cannot receive payment without investment. Are all PTC sites have the same feature as this? Do you know any PTC sites that really pay to its standard members? Any help please....