I get that match going fans are a huge part of the club, this is for every club. I would say alot of the PL clubs have atmosphere created by match going fans, those clubs are not as big as United. Why? They still have atmosphere, they still have match going fans.
Also, a few people dont even see eye to eye with match going fans who are not from Manchester, take Wum for example, saying they have to be local. Season ticket holders who travel hours for each game spend even more to get to a game.
When Manutd go abroad on pre season, why do we always have the sell out crowds? Is it those local fans going in their 50,000's numbers to watch pre season? No, its the fans in those countries who fill out a pre season game, speak to any player who has every played for Manutd, they will tell you they dont realise how big the club is until they go on pre season.