The practice is controversial due to Cup drivers such as Kyle Busch, Kevin Harvick, Mark Martin (numbers one, two, and three all time in wins in the Xfinity Series), Darrell Waltrip and Dale Earnhardt entering a large portion of races over the course of the season and dominating the races in superior equipment, taking good finishes, competitive rides and sponsorship, and exposure away from both development drivers and veterans who are regulars in the series. Many NASCAR experts, however, contend that without Cup drivers and the large amount of fan interest and sponsorship they attract, the series would cease to exist.