Superb post and well said, Powering Up is the single most important any of us on Steemit can do. It's nice to earn rewards for our work - but how do they get there? Steem Power is the reward pool that ensures everyone can have a reward for their post - Powering Up is investing in the platform and ensuring it continues to grow. I would say that choosing 50/50 rewards can still help you and the platform - because if you use the earned SBD from posts to invest in your future posts using the available upvote services you can increase both your own rewards but also the Steem Power to keep steemit running.