As they say "One Bullet is Enough to Take Down an Empire", just need to know where to aim. I believe same it the situation Steem power, unless and until someone wants to develop the targeted Steem tribe, help other in curation, and promote manual and good content, then whatever is received on regular basis should be enough for regular content creation and curation. How much Steem do you need??? Hmm, to be honest it is very complicated yet very simple question at same time. This is to be decided by individual, because it more steem power has more responsibilities otherwise someone can get selfish and ruin the beautiful gift of Steem power.