It's one of the most basic principles of economics: people respond to incentives. And when it comes to incentives, the National Hockey League creates some pretty perverse ones.
If we want teams to try to win, we should reward winning and punish losing. But the NHL offers a hefty reward for losing. The worse teams do, the more likely they are to get a high draft pick the following summer. A top draft pick can land you a franchise player that can bring success to your team for years to come — a Sidney Crosby or an Alex Ovechkin. It gives teams who don't think they can compete for the Stanley Cup an incentive to tank at the end of the year. Sure, there's a lottery that creates some uncertainty around what team gets which draft pick, but it depends on a rigid formula that ensures teams that lose are still rewarded with high picks.