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perhaps you can publish some sort of steemvoter statistic report each day to get your daily rewards

Yeah I was thinking that too. However, that requires work, and $4 a day isn't worth the time.

if you were doing the report every 2 days, then it could go to $40 per day after 14 days

another good test is try to get the $4 with the smallest amount of votes possible, as it is more profitable for other voters to upvote $$ posts that do not have allot of upvotes on it