Each and every pair of socks is mated for life and wear-leveling is only a problem to the extent that I favor my dominant foot.
The clips have a high retention rate such that no more than one clip comes loose each wash cycle, which means it is obvious which socks made the failed escape attempt.
This hasn't been a real problem for me. I'm not sure why. Some of it may be that I buy black socks, not white, and some of it may be that I mix freshly laundered socks into the clean sock collection, so every sock gets used about the same amount overall.