Sir booster wrote wrong in steembottracker. There is no minimum ROI in booster. If there is any minimum ROI then you will not got 10 steem loss. In 0% ROI, we will not in profit nor in the loss. But you have lost 10 steem even you got some free big votes. Just go https://steemworld.org/@majes.tytyty and check coming author rewards.
You send 50 and you got $16 upvote. How do you think that you will get any profit? For 50 steem, vote value should be $21 for getting 50 steem back. But you got $16 upvote and this is a huge loss.
I now see that the Booster's "Min ROI" is not functional. Thanks for the info.
But you should also be careful when you vote. The best way to ensure that you do not lose money is to use SteemBotTracker. To blame me for your loss is not very decent.