Don't get me wrong, the value of USD, GBP, or YEN can rise and fall relatively quickly. The conversion rate of GBP to USD dropped from about 1.40 GBP/USD to 1.20 GBP/USD in the span of a year. But cryptocurrencies can cause devastating losses. BTC dropped nearly 30% from Dec 2017 to late Jan 2018, and it has been on the decline ever since. It seems that the only way for a business to confidently convert BTC into the 0.25 USD would be to do nightly-ish transactions.
I'm familiar but not well versed in BTC operations. I don't know how much overhead (fees) would go into nightly transactions, and how much the fees would rise with the volume of each transaction.