It's a good question, actually now that I think of it. Obviously, insider trading, but as a society we have long decided that this is evil. And if we compare

It's a good question, actually now that I think of it. Obviously, insider trading, but as a society we have long decided that this is evil. And if we compare markets where I am ready to put my money where my mouth is, then this actually is called gambling. Just not a game of chance but rather game of skill.