[kolev]

Well, tell this to the folks who hold Bitcoin. They love when big merchants start "accepting" Bitcoin, but secretly pray that they won't have much sales as the selling pressure will drag the price down. So, there's a difference as this isn't a highly liquid market. If you pay Microsoft USD via your European credit card, EUR is sold for dollars on the Forex, but given that this is the most liquid market in existence, you're not gonna affect it. On the contrary, we often see on Bitstamp how 100 BTC can drop the price by 5-10% with a weak orderbook. I hope you get my point why there's a practical difference.