Hello,
When we create a post bottom right you can choose to automatically power up 100% of your author rewards, or default 50/50% or decline payment:
You know who post with 100% power up looking at the right of the post tittle, if you see steemit logo the author is powering up at 100%.
Ahhh yeah yeah I get it, I got confused lol. I 've never tried the 100% power up, and maybe I should as you said, it's for the benefit of steemit platform. And I like this to continue to exist. Thanks @damarth!