Comment: Good questions!

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In reply to comment: I'd also like to know why (see in situ)

Good questions!

1. Because most people are new to bitcoin and find the exchanges easier. Just wait till we start seeing bitcoin ATM machines; deposit Frns for bitcoin or vice verse.

2. The exchanges are already establish hubs for exchanging bitcoins. People gravitate to what's easier and already established. Oh and yeah man you and I can creat our own exchange if we wanted to. You can also find people looking to sell and buy bitcoins all over the net. You can definitely use exchange companies based in other countries too; such as bitstamp.net based in Slovenia.
Also checkout localbitcoins.com

"We’ve moved beyond the Mises textbook. We’re running in the open market." - Erik Voorhees