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Right now SBD are valued at $3.30 https://coinmarketcap.com/currencies/steem-dollars/

You think you have a SBD at $1.00US but in fact it is valued at $3.30 when converting to STEEM. No idea why SBD is on a roll! The rest you need to put together for your self. I'm not an investor advisor.

all good points and I like the way you get some exercises started

Trading can be very delicate. The best resolution in my opinion is to buy STEEM with $SBD and then trade the STEEM for whatever crypto you want. I just bout 473 Steem for $69 SBD. The Steem is trading now at $1.85 US. You do the math. I'm not advising. I'm not a professional financial advisor. Just relating to you an anomaly I uncovered re $SBD.

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STEEM 0.17
TRX 0.16
JST 0.029
BTC 60661.72
ETH 2395.32
USDT 1.00
SBD 2.56