'Everyone else' doesn't get paid in line with performance.
Anyway you can't compare employment in major league baseball to other jobs. It's a unique system. Teams have players under their complete control for the first 6 years. A young player might be MVP and get paid minimum wage, and they don't get paid an extra $50 million for that, do they? If the player is still around after those 6 years they get their crack at their big payday in free agency and they get the upper hand. It all pretty much balances out at the end of the day. The teams aren't suffering financially, that's for sure.