More specifically when it comes to video games, multi million sometimes billion dollar company's spend money to keep their secrets, which includes other mass media such as TV and Movies, but the question becomes.
Where do you think "Leaks" really come from?
A follow up:
What do you think should be done with those that do leak information civically or maybe criminally ?
Keep in mind sine leaks and information can enrich those that do, and can also help cripple a business.