In spite of the negatives of the practice, the presence of NASCAR's top-level drivers attracts sponsorship to the lower series that may not be there without them, adds credibility to the series, and makes it easier for tracks to promote races. Many series regulars have also pointed out that the presence of Cup regulars allows them to improve their own driving styles and compete against the best in the sport. The series does still serve its purpose for driver development, with a steady influx of successful new drivers into the Sprint Cup Series: e.g., in 2007 three of the Top 10 drivers had less than four years of Cup experience, eight of the ten had less than 10 years of Cup experience, and only one (Jeff Burton) was over 40 years of age. All eight drivers of the 2014 Sprint Cup Rookie class (Kyle Larson, Austin Dillon, Justin Allgaier, Cole Whitt, Alex Bowman, Michael Annett, Ryan Truex, Parker Kligerman) had significant experience in the Nationwide Series, with six of them running at least one full season. The series also continues to provide an outlet for former Cup drivers (such as Elliott Sadler, Regan Smith, and Sam Hornish, Jr.) to rebuild their careers, or as Dale Earnhardt, Jr. plans, a way to race a limited schedule in semi-retirement, as does the Truck Series for drivers such as Ron Hornaday, Jr. and Johnny Sauter.