Question about rewards?

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Two weeks ago I posted this article: link to article

It was my most popular post and it got $0.91 with 78 votes, I chose 50/50 rewards on my post.

When it was time to claim my rewards I got 0.408 SBD and 0.095 STEEM POWER and it got me thinking, this isn't really 50/50 right, if you look at the prices of the two (and I know it fluctuates) the SBD is worth much much more. My question is: Why? what is the formula that decides your rewards. Because this would mean choosing 100/0 is never a good option, as you can transfer the SBD for more steemit than you

 I looked around a bit but couldn't find the answer. If anyone could help my I would greatly appreciate it!

Question about rewards? | Ecency