They already spend more than 4K more than does say Jeffco or Adams12 or DPS per student.   About 3.5 k more than BVSD.   

With only the top 20% of its students participating in ACT and SAT testing and many students not participating in standardized testing it's hard to say their results are any better. In fact given the best students there are barely testing above the Colorado average there is a good case to be made that they are even getting the same education as they would get in Colorado.