Why their posts appear in the digest?

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My email receives ‘Mylot Digest’everyday,and those posts were responded a lot.At the same time I found that my post receives more respondences,the more I can earn coz on the day if I didn’t post and respond anything,someone responded my post,my earning increased. So I think being responded a lot is very good method to increase earning, while I don’t think their posts in the digest are so much better than those of most of the mylotters. Actually I know that those posts are in the digest coz they are responded a lot but how can they be like that? So how do you think? And is there any good method to to get more respondences?