There's also the fact that there's much more at stake than simply basketball-related revenue.
When LeBron James joined Dwyane Wade and Chris Bosh in Miami, I predicted that the CBA was going to run into problems because of the forming of superteams that would leave the small-market teams (Jordan's Bobcats, Paul Allen's TrailBlazers, and so on.) in jeopardy because, simply, there's no way they can draw the Melo/Amar'e teamups or the Wade/LeBron/Bosh trio.
The hard-line owners want to keep the league competitive and their franchises afloat. Life is great for us Knicks fans because like it or not our franchise is never going to have to face the possibility of contraction, but the owners of small-market teams are fighting so hard on this CBA because they don't want to imagine the possibility of the NBA season essentially being a LA vs. NY vs. Miami year-long battle with the other teams just losing for the hell of it. They're fighting the battle on BRI because they know that if they give the players an even larger portion of the BRI then their franchises are going to collapse due to lack of competition.