Yes, I may be off since I haven't really sat down and figured out the variation between STU/SP/steem/sbd. What I do see is that you can send the 0.100 SBD and get back about 0.200 (STU?) in the form of a vote(s).

0.200 x 0.75 = 0.150 which i think we agree would be the overall STU for the author. At that point I don't care if it comes in any form so long as it is worth more than the original SBD. I got the SBD from votes in the first place, and was going to trade it for steem and power it up anyway so anything that comes back as SP isn't considered a 'loss' by any stretch. According to steem.supply i should get back the sbd I put in plus a little SP as icing on the cake. Those that sell the vote get my direct sbd and some of the curation, with hopefully more of the curation going to people that voted me organically. Anything that comes back to me as SBD can go right on out again until it's all SP.