There are a lot of good reasons to use MtGox. Arbitrage for instance. Buy on one exchange, sell on MtGox at 10% more, withdraw, repeat. Domestic JPY withdrawals work smootly. EUR as well, just quite slow. No reason to be shocked about that. People selling their coins for cheap at other exchanges is more shocking to me.
Arbitrage? Sure, lots of people must be doing this since there is a 12% price difference between functioning exchanges and your clowncar mtgox. Sure.
Yep, finally a good opportunity for EUR users again. Japanese banks have been closed for a whole week for the Japanese New Year celebrations. I expect the difference to decrease quite fast during next week, since it has become possible to move JPY again.
12% may sound attractive.. but then you deduct fees and consider that it takes one month or more to get EUR out of mtgox. 8-10%/month in "arbitrage" is, to me, not worth the risk of using that joke of an exchange.
The delay is 3-4 weeks, not one month or more. And arbitrage is 0 risk by definition. If you manage to make it risky, you are doing it wrong. The delay limits how often you can get your 10% or more profit, of course. You can easily make 3000 EUR or more on arbitrage every month using normal SEPA transfer, which means you can make a living just by doing arbitrage. Japanese users can make a fortune. Don't quit your job yet, however. When Moneypolo withdrawals are enabled, I expect the prices to become more in sync again.
We are not selling coins "cheap" at other exchanges, we sell them at market price. By market price I mean the price you can sell for and actually get your funds within a day or two. mtgoxEUR and mtgoxUSD worth less than real EUR and USD. As blitz said, it's been like this since June 2013.
When I can buy from you 12% cheaper than I sell for on MtGox, you are selling cheap. The situation has been opposite on several occations since June 2013. It has taken a while, sometimes more than 12 hours, for other exchanges to get back in line after large dumps on MtGox. For arbitragers with fiat reserves on MtGox, this means you can arbitrage in the opposite direction and hold to do another round when MtGox bounces back.
The only exchange where I can sell my BTC and get my money within a day is my own, btw.