I just bought a small amount of btc to purchase a product without dipping into my larger storage. By the time the btc got from the exchange to the market wallet, my btc were no longer valuable enough to purchase the product I desired.
Can someone remind me why btc is master currency?
Well I dont think that you should be questioning the long term viability (master currency) of bitcoin by its short term volatility. I would simply suggest that when you pull from the exchange you transfer a bit extra to ensure that a dip in value does not delay your purchase. $50-$100 daily swings are nothing special currently. In a year from now well experience a lot more stability but for the time being...