If you blog, comment or curate everyday you probably want as much Steem Power as possible, you can always upvote trade or sell excess SP at say +95%. If you don't have time, I think delegating makes sense well under 5000SP. I am trying to maintain around 50-50 to various causes and groups until I find a few I really like.
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I would never vote trade etc as the returns are not great and I use my vote to support the people I follow. If I don't have time I will use steem auto vote as not only are you supporting those that you follow, but the returns are much higher than you would get by delegating to a bot.