Sites with Many Responses get more or less or same depndg

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I notice sites with many responses and I wonder whether it is worth it posting to them or whether I should concentrate on the sites with few responses. I know the latter often can't make a decision about their problem because there was not that much imput. Now giving that the same amount of time is spent on a response as well as about three to four sentences to each, do you get paid more for the ones with many responses, the one with few responses, or is it the same, more or less?