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I see you opted for the 100% powerup option when you posted. You might not know, but currently SBD are trading at well over 1$? (Actually it's currently around 1,9$) Therefore it makes more sense to take the 50/50 option, and trade the SBD in the internal market

This will increase demand for steem (therebye raising it's price)
And it will increase supply of SBD thereby bringing it's price back to it's intended value of 1$.

Once you've traded it, you can power up with that steem, and end up with more steempower than if you would have gone for the 100% powerup option

Thanks for the tip I had no idea!