Scooby-Doo
Ruh-roh
You said it as an absolute just like I did. Maybe I should have said "it's one of the reasons" just like you should have said its not the only reason.You want me to provide a source to prove that parity is not the reason NFL is the most popular sport in the US? You're the one who said it was. The burden of proof is on you.
You honestly think the reason NFL is more popular than MLB is because of parity? If so, please let me know how you define parity in this context.
I did a quick google search and found this however. BTW, I'm not a fan of Bleacher Report, but I found this with no effort.
Why the NFL is the Most Popular Sport in America | Bleacher Report