This is called Japanese efficiency in the modern western way - but it is obvious that after the capitulation in 1945 they fell under the strong influence of the US, and today we see the results - they need 10+ years to return money to their rightful owners and are the most indebted country in the world.
It's not just Mt.Gox, it's a fact that we've fallen into the spot ETFs black hole again - about $900+ million outflows from them have been recorded in the last week, and along with that there's been speculation that the German government is making transactions with about 50 000 BTC that were seized a long time ago from some pirate site.
In addition, summer in the northern hemisphere is usually not the time when people invest, but when they sell - yesterday I heard information that the average tourist from the US spends approximately EUR 400 a day when he comes to Europe.