While Cup drivers attract fans to the lower-tier series, many fans are turned off by the dominance of the senior circuit competitors over their junior league competitors, with Cup drivers often winning over half of the races in a season. Comparisons have been drawn to a top-tier Major League Baseball player competing against minor-leaguers, or adults competing against children. Some drivers, including Dale Earnhardt, Jr., have also been critical of the dominance of Cup competitors. (During the 2017 Xfinity Series season, Earnhardt's four full-time Xfinity teams were driven by Xfinity regulars, and Cup drivers ran a fifth car in only four races. Earnhardt plans four full-time teams in 2018 and no Cup driver is scheduled in his fifth car, which he will participate in a minimum of two races, but will not be a Cup regular.) Many fans, as well as longtime series regular Kenny Wallace, also note the increased focus given to Cup drivers during the broadcast and promotion of the races. This changed beginning in 2012, when NASCAR produced several commercials promoting up-and-coming series regulars.