I worked at eBay customer service back in the day, and this was exactly how it worked. In fact, they had automated call statistics not surprisingly. If you had calls within the average handle time (AHT), and high satisfaction and resolution scores you were mostly ignored. Managers pick a random call or two from the team, screen it, and move on. If you're struggling they're likely to listen to your calls and give you advice. If you're doing well, they tend to pull a call and analyze it in a group meeting for others to pick up your tricks. The managers at eBay at least (and Apple I suspect) are only concerned about their overall team statistics.

Many managers think fear works to improve stats.