While I love this idea. I also want to take the time to mention a challenge. I strongly suggest always powering down as giving SBD/STEEM seems to be the purpose. Think we should aim to giving away as much as possible like United Way which at one point giving away 98% and only using 2% for expenses. While I understand that 50% is locked in SP which has benefits too. I think giving away the maximum would prove most beneficial in the long run. So the idea be would to donate the liquid amount and continuously giving away the liquid reserves. Maybe explore ideas of what percentage of rewards to give away too.

Would like to also propose an idea of how much of reserves to give away. Maybe to always reserve 50% of the reserve pool to keep a growing pool.
Then to give away relative to the vote $ amount as a way to measure and compare votes and SP interest. Then say the highest vote payout amount is $100 one time, that charity could get 100% of the 50% of the charity pool.
Then the next time if the payout of the winning vote(d) charity choice is about $25, that charity would receive 25% of 50% of the charity pool.
This way charities the community is more interested and supportive of along with higher SP holders would get a great share and benefit.
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