"Best Fans in Baseball" - The St. Louis Cardinals
"Greatest Show on Earth" - The institutionalized animal-cruelty machine of Barnum and Bailey
I could probably pull out a thousand other cliches that sports teams all over the world use to describe themselves, their fans, or their venues. Why is Fenway calling itself "America's most beloved ballpark" so offensive? It's just a cliched, catchy motto. It's not like they're demanding it be codified as a law by Congress. It's all in celebration of a passionate fanbase and an historic stadium. I think you're taking it way too seriously.
As for concession prices, that's a given no matter what sport or stadium you are talking about. A baseball team needs to pay salaries. Not only the obscene amounts of money that players receive, but the salaries of the coaches, front office staff, groundskeepers, concession stand workers, security, and custodial and maintenance workers. They have to pay for the food they supply for concessions, the alcohol, the cleaning supplies. The team plane and buses probably cost more to maintain than an average suburban house between fuel and repairs. The amount of personnel, supplies, and services that a major league sports franchise pays for rivals that of a small midwestern town. With all that in mind, I'm not inclined to complain that my food costs a little more than it does at a restaurant.
You seem to be taking all of this as a personal affront. The Red Sox are not conducting a massive disinformation campaign against their fanbase, hell-bent on tricking us all into loving the Red Sox. We already love the Red Sox. They are simply taking advantage of our love for the Sox and turning it into an opportunity to make more money. Money that they will use to pay players who can win games, and make repairs and upgrades to the stadium and surrounding areas to make the experience of a game more comfortable and entertaining for their fans. That is what a good business does.
When the Royals or Rays increase ticket prices after they start playing well, it's not because they are milking cash from people they don't care about, they are doing it because success brings in more fans and they need to upgrade the available fan services. This is the same principle on a larger scale.