They have contracts with TNT which is owned by CBS. CBS knows that getting them air time, regardless of their knowledge, will drive ratings because they are known sports talk heads. I'm guessing neither of them really enjoy the fact that they're probably given 2-3 weeks to find out as much as possible about college basketball as possible, but they are probably contractually obligated to participate in these shows. This is why TNT stops their Thursday night double-headers during the early weeks of the tournament, because they can make more airing NCAA tournament games. Long story short, they're pretty much contractually obligated to do NCAA games instead of NBA games during this time frame.