Ok thank you for your explanation Hive account@rodrigomf.
But I think I still do not understand it all..

• Why do you calculate the ROI in STEEM when the bid was done in SBD?
• I don´t understand what is the "Vote Reward Unit", it is new for me! I thought rewards were SBD too.. Where can I learn about it? I have not found it in Steemit.