Some very interesting thoughts there!
So, in regards to votes for those 3 accounts, the display doesn't show at all. I actually have all the posts automatically upvoted as you post them, hence the delay shouldn't even be an issue. It's simply not counting the votes at all.
Now, regarding the 50% vote, my concern here is that it makes the discount appear sort of... artificial. For instance, my current discount is just over 50%. However, I'm now going to be receiving half of the vote that I previously received, hence, compared to before these changes, my discount per CCD is actually only about... 6%.
Maybe the discount % could be optimized a little bit more so that there's a slightly bigger real change in discount? Just throwing this suggestion out there because I'm already close to the maximum for some of these discounts, and it's still not a big difference compared to before - and for others, they'll feel the weight of the discount even less than I would.
I do like the proposition for coughHSBIcough! I'm a big fan of that program and would be very interested to see how you implement this. The idea for a special account (maybe one that's only for bigger supporters) is also interesting!