If by powering down I am paid a weekly payment of 1/104th of my SP, could this payment increase each week as my SP is rising, or is this only based on how much SP I had at the time that I chose to 'Power Down'?
It is based on the amount of SP you chose to power down. Your SP holdings could keep increasing though despite the power down - although the 1/104th payment will be the same.
You can initiate a new power down at any time (at which point the 1/104th slice is recalculated based on the SP amount you hold at the time when you click the button). So in this way you can increase the SP amount withdrawn (if in the meantime your SP is growing faster than your withdrawal rate).
So, yes or no, 104 weeks after a full power down and earning no SP rewards, will my SP balance be 0?
Even if you get no rewards, the balance is still going upwards due to the programmed growth. So the answer is no.
If you have 1000SP to withdraw, and you get no curation or author rewards, you'll get the 1000 out in 104 parts, but when you have finally pulled out the 1000, there will be more in your account from the "interest" of the initial 1000.
It is based on the amount of SP you chose to power down. Your SP holdings could keep increasing though despite the power down - although the 1/104th payment will be the same.
You can initiate a new power down at any time (at which point the 1/104th slice is recalculated based on the SP amount you hold at the time when you click the button). So in this way you can increase the SP amount withdrawn (if in the meantime your SP is growing faster than your withdrawal rate).
So, yes or no, 104 weeks after a full power down and earning no SP rewards, will my SP balance be 0?
Even if you get no rewards, the balance is still going upwards due to the programmed growth. So the answer is no.
If you have 1000SP to withdraw, and you get no curation or author rewards, you'll get the 1000 out in 104 parts, but when you have finally pulled out the 1000, there will be more in your account from the "interest" of the initial 1000.