For every driver that wants a practice session, there is at least one that would rather it be a qualifying session. On a two-day weekend, additional sessions mean additional down time, which is extremely valuable when trying to provide a good racing experience (with good run groups). Every minute of track time that doesn’t count for something takes away from actual racing.

Nearly every Majors event (both two and three-day) is preceded by a track-operated test/practice day. While run groupings are not ideal, it provides a tremendous amount of on-track minutes at a cost lower than a private rental, often $100 to $300.