Of course, you're not rewarded in USD. I simply considered the currency to make clear that you're losing money after all. According to my calculation you're losing an amount of 150 USD (in SBD).

Don't get me wrong, it's your money and your choice. I just wanted to open your eyes :-)
Vote trading has a quite bad reputation currently. Some users who use them excessively have been flagged in the past.

Best of luck!