I am curious while looking at my blog list and seeing the prices there...

Why does it say it is "Potential Payout"?
Does this mean that it could be less than $0.15 Steem / Steem dollars?
Is it because it depends on exchange rate?
Advises are welcome!
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Did you find the answer to your question?
Yep. Because before the 7 days of maturity is completed. This value will fluctuate based on the daily value of SDB against USD. So it could be up / down before it is confirmed.
Moreover it is also potential because there could be people keep upvoting (or even down vote!) until the last 12 hours before it matures. :)
Thanks for clearing that up.