I have met some few funny people who were even trying to power down the delegated steem power given to them when they newly joined steemit.
Investment on Steem Power is a digital gold mine which SBD cannot guarantee. Just like the name implies Steem Backed Dollar(SBD) which means SBD is a subsidiary not the main currency.
One good things I love about Steem Power. It can bring SBD, steem and also more Steem Power when you curate posts.SBD cannot do that.
Whales organising contests and requesting voting the post as a cateria for one to be qualify in the contest is like bidding for upvote which he uses to build up his steem power.
Steem power is that online resources which can yield more value in few years.