It would be better if it actually used the current value of SBD though, rather than what I can only assume is the expected pegged value of it. So if you're claiming 50/50, half of that is non-moving and assumed to be worth US$1, while the other half (representing the SP portion) is varying with the Steem price. If both halves varied with the actual price of SBD (even if it was the internal market's price) that would be an improvement.