You've only sent 0.01 STEEM which is less than 0.005 SBD and you've got 0.001 STEEM change back in a transfer. How exactly did you calculate the ROI? Try a bigger amount like the one I've bought here which is $0.27 for sending 0.3 SBD and getting 0.074 SBD change back so for spending 0.226 SBD, I've got 0.271 SBD in upvote which is 120%.