If you're pulling data from the Coinmarketcap API, I think people would be confused if they keep hitting refresh and see prices go down or up with no apparent change or additional interaction with users. People might also get super disappointed if they expect a large payout and then a week later SBD crashes and they get a fraction of what they were expecting in USD.

Another (albeit trivial) issue - how do you handle which currency to show? Not everyone here is American.