Dont understand BTC exchange prices.. Can someone explain pls?

[Zeryk]

Hi,
I recently registered to three exchanges, mtgox, bitstamp, bitcurex.
Why are their prices so different? I understand, that mtgox vs. bitstamp difference is in fees, but why is bitcurex-eur so low? bitcurex-pln is 10 eur higher. Is there possibility to make easy money then, isnt it? So why people are not doing it, prices would go to same then..
Links:
https://www.mtgox.com/?Currency=PLN
https://www.bitstamp.net/
https://pln.bitcurex.com/
https://eur.bitcurex.com/

[xchanga.com]

it really depends on when they get stock.
someone with old stock can sell lesser than someone with fresh new stock.
and also some service can be selling with less profit to get more customers while some will like to make huge profit.
so its general with services.

[MAbtc]

MT Gox has a premium because fiat money is stuck there--you can't get it out. (Some people think they may be insolvent...) Otherwise, I couldn't really tell ya. BTC-E tends to be a bit bearish.