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It's an additional incentive to holding STEEM. You'll gain a bit of inflation by default based on the stake you hold, in addition to curation rewards and if you choose to do so, author rewards via vote-selling. On the other hand, you can also just delegate your Steempower away, for example to a project that gives you their own tokens in return.

It makes sense if you like rewarding people for posts, comments and whatnot.

With the 50/50 author/curator changes coming on HF21.. It will be more lucrative curation wise.

  1. Pennies add up to dollars.
  2. See number 1