Why people focus more on ptc and ptr sites and less on sites like mturk etc.

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Hi folks. There is a question which revolves in my mind and I want your sincere responses. I find more people who are eager to know more about ptc and ptr sites for earning money. But there are sites like mturk, shortask and widecircles through which we can earn more. I have worked on all these sites. Widecircles is very good At the same time mturk and shortask are also very good. But I dont find more discussions on these sites. Please post your valuable responses. Thanks.