PSN still makes more money than the entirety of Nintendo Co., Ltd.

[Chrizum]

VideoGameAccountant said:

Yes you are totally right, and all that influences the evaluation of the company. But you also understood that a lot of the "value" is based on speculation and manipulation as well.

Unless you want to define what manipulation happens, I think yu misunderstand how the market works.

The price is simply what investors are willing to pay for a company today. The price changes base on Buy and Sell volume in the market. Usually a stock goes down in price because there are more sells than buys and it goes up when there is more buys then sells. The market is so volatile because there are so many people in the market. 

There is speculation as well, but that is due to the fact you are also trading on the future information. Of course, not all of this is captured in the current stock price which is why they can crash or rocket upward. 

This is a common misconception and really isn't true at all. For every seller there must be a buyer, otherwise there'd be no transaction. The question isn't how much stock is being sold, but at what price are investors willing to buy? The more people there are in the market, the less volatile the price of a stock usually becomes as it can't be "manipulated" (influenced) by a small group of people.