Thanks for your great support!
The $ symbol is neither SBD nor USD, it basically means 'STU' (Steem Token Unit). Here is a pretty good explanation by witness @dragosroua:
I also wonder if the value is what I'm getting, or the total amount going to curators, beneficiors, etc.
The $ amounts are always gross amounts. When in the process of creating a post/comment there have been any beneficiaries set, they will receive the defined percentage of the author rewards (currently only SP, from Hardfork 20 on also SBD and liquid STEEM).
Currently when the 'SBD Debt Ratio' is > 5%, the 'Liquid STEEM Ratio' is 100%, means we get 100% of the SBD reward as liquid STEEM. As long as the debt ratio is < 5, we receive SBD with the author rewards.
<= 2% debt = 100% SBD
3.5% debt = 50% SBD
5% debt = 0% SBD
But this will also change a bit with the coming HF20...