It is better, for a long-term investment, to just use the internal market to turn the SBD into STEEM and then into Steem POWER. The mower Steem POWER you have, the bigger your upvote is and the better you can pay yourself.

However, the SBD iou is in your Wallet, so you are just selling the IOU to someone else. If the top witnesses did their job correctly, SBD would never get over $1 and they would put the convert option back on the Wallet. Since nobody is buying the SBD, I always assumed that the convert option would actually destroy the SBD iou.