You are in club5050 if you powerup 50% of your earnings - 1 month
Club75 if you powerup 75% - 2 months in a row
Club100 if you powerup 100% - 3 months in a row
The amount you earn is not important. It automatically happens. Some use the hashtags others don't.

Benefits? You save + there should be a differrnce in amount if the same % of upvote is given but if that's true? I believe it has more to do with what is in the wallet.