It is not so much about the retail investors as it is about the professionals. Most of the market is determined by them, in a world without them, prices will le

It is not so much about the retail investors as it is about the professionals. Most of the market is determined by them, in a world without them, prices will less accurately reflect the 'true value' of stocks. As such, we want to keep them trading. We also kind of want to dis-incentivize the professional traders from engaging in massive corporate espionage. Just because that is an arms-race that isn't very productive.