the big difference between MLB and premier league football is the amount and length of games. A regular MLB season has 162 games, post season could bring you in to the 180s. Nobody goes to all the home games, groups buy 1 season ticket to share, baseball is far more of a one off event for attendees, the average fan might go 2 or 3 times a season. They make a day of it as the games are longer.That has zero to do with sophistication. That was my point.
Passion is another thing. And you MAY be right, but you are comparing apples to oranges.
Look, high school football teams in several parts of the US routinely get 10K a games and many get considerably more. College football has several stadiums that fill with 100K each week and dozens of teams all over the country that average 40-50K routinely. Many of these teams are every bit embedded into the fabric of its locality. That's just one sport.
It's all subjective for sure.
As far as wealth, it's tough to find city income per
capita stats. London is behind several US cities from the lists I've seen, but most of that is GDP based. It's clearly a wealthy town, though. But as far as countries go, discretionary income is like 28K vs 44K per capita. Its not very close.
I think it's tough to argue that the DC area and its surrounding suburbs is the wealthiest area of the US. 5 out of the 10 richest counties in terms of media income per capita are around DC. I'm sure a case can be made for smaller communities in and around San Francisco and NYC - Connecticut probably, but those are smaller areas.
Who ever is running the numbers for Everton is far more likely to be looking at Juventus or Atleti than the Nationals.