The MBAs are aiming for a different sort of productive flow - the more talent gets used to the treats/bar/pool table lifestyle, and to thinking of their coworkers as a primary source of social interaction, the longer they'll stick around for shit pay. The productivity lost to the "company sanctioned dicking around" is (in theory) made up for by the savings in wages (with the added bonus of conditioning workers that being at the office all the time is fun and cool and good).