How about the most loyal fans in football? Cleveland Browns fans. Why are they so loyal? They've won nothing in our lifetime.They show up because the eagles have EARNED that level of loyalty by . . . wait for it . . . winning. When your team makes the playoffs in 17 of 29 years it’s easier to endure the down times because you’re confident they’ll turn it around. When your team has made the playoffs 6 of 29 seasons you just haven’t earned the fans trust and dedication.
A 2006 study conducted by Bizjournal determined that Browns fans are the most loyal fans in the NFL. The study, while not scientific, was largely based on fan loyalty during winning and losing seasons, attendance at games, and challenges confronting fans (such as inclement weather or long-term poor performance of their team). The study noted that Browns fans filled 99.8% of the seats at Cleveland Browns Stadium during the last seven seasons, despite a combined record of 36–76 over that span.
Back to the Cardinals poor fanbase - There are also plenty of locals that have never and will never embrace the team because they already had a team before the Cards made the move to their third city. There are others that have never and will never embrace the team because they wanted but did not get an expansion team. There are many more elements at play than just winning. These days even when the team is winning there are people who would just rather watch it at home on their big screen. Or there are those who would rather have money in their hand and an opposing fan in their seat. The list goes on and on.