You answered your own question -- because idiotic, false, factually unsupported statements like this keep being made.
Ok, you want facts. The Devils play in the most densely populated area in the country. They also play in an area that has one of the highest per capita incomes and most disposbale income in the country. They put a succesful team on the ice every year, and yet they are at or near the bottom of the league in attendance every year. Why is that? According to you there are tons of Devils fans, and yet they don't sell out playoff games. Let me here your briliant rebuttle. Let me guess; ticket prices, blah, blah, blah, parking, blah, blah, blah, traffic, blah, blah, blah, meia bias, blah, blah, blah.