Sawdalite
SelectLouNolan4PFHoF
So according to Forbes team valuations:
Eagles: $2.5 billion (2016)
Phillies: $1.65 billion (2017)
Sixers: $800 million (2017)
Flyers: $720 million (2016)
That's probably a reasonable reflection of the teams' relative popularity.
The way I understand it, the criteria that makes up Franchise Values would show that Local Popularity is not a driving force on their worth.
Major drivers would be: Huge (Multiple) Network Contracts that run for years... Local Media Rights and Broadcast/Cable setups... Cost for an Expansion to enter League that gets shared League Mambers... Share of Revenue to League from endorsements... Revenue share from League associated Merchandise... Value of League Teams recently sold... Projected Cost the particular Team based on Location and current Assets... Yada, Yada, Yada.
Overall NFL Revenue and General Team Sale Values alone make the Eagles worth insane money... MLB and NBA massive Multi-Network Contracts alone give the Phillies and Sixers a great boost over the Flyers who are in a 'Niche Sport' that not very long ago came off of a National Network Contract where the NHL literally had to pay the Network to put out their Games for their Fans to see... TBH, IMO it is a wonder that the Flyers are that close to the Sixers, Phillies and Eagles.
... In Boston the Sox are arguably more popular than the N.E. Patriots... but according to that same Forbes list the Pats are at $3.4B and Sox are $2.7M.
The Sixers may and probably always will be worth more than the Flyers... but IMO that doesn't mean that they are more popular.