Because people think that Nintendo deserves that money and pirating is unfair and wrong. In a vacuum, they do make good games that are worth the money but with all the shit they're pulling, they're basically abusing the law and their power as a huge company to force people to do what they want. That's why, in my eyes, it's only fair to pirate their stuff. If they're gonna play unfair, so am I. There's a huge chunk of people who aren't that well informed on what Nintendo's doing and why it's wrong, who don't want to do something illegal or who just want the convenience tho.