I see it differently.
Players have often taken less for better teammates, including the Big 3 and Mike Miller back in 2010. The CBA hit players really hard while teams, players, and agents are still trying to finagle whatever they can within the rules. But make no mistake that paycuts have been around before and after the CBA, and the NBA isn't the only league that sees it happen.
If a player handles his finances well, and many don't, then the difference between banking $82M and $88M over the course of his career isn't too huge. Especially when it comes to championships and playing alongside a close friend.
Both Ray Allen and Miller were reported to have strong intentions of going wherever Lebron went this offseason. If money is a secondary concern at this point in their careers then it isn't up to them to fight against an oppressive CBA, cap limits, or any other political aspects of the game. A strong locker room, conserving their aging bodies, and playing for championships can be more meaningful that brag cash.