The trading volume of SBD is four times higher than the whole market cap of SBD. How could it be? In my opinion people speculate on SBD because of its low marketcap and people don't really know what SBD is. People have also take into account that inflation of SBD rises with its price. And inflation then causes downward pressure.
Here I have a chart where you see the price of SBD versus the inflation:
Its from my weekly steem statistics. https://steemit.com/steem/@sevenseals/steem-statistic-charts-week-03
I think there's something wrong with the way Upbit reports the data. It may report it as USD, when in fact it's KRW, which results in higher volume numbers (possibly 1000 times higher).