What your saying claims that by going to a game that makes someone a fan, or by not going you aren't a fan, which isn't true. It just means more are willing to pay for the experience as the product on the field has improved. Or they are too far/can't afford it/would rather watch comfortably from home. Is level of fandom dependent on game attendance? There could be someone at the game with a friend who doesn't care about the Jays at all, its a night out, while a die-hard fan in northern Alberta is watching from home. What about someone who is a big Jays fan and now the team is good so they actually go to a game, make a trip out of it. They've always been a fan but now they're attending, is that fair-weather?
To me fair-weather fan insinuates switching sides, "oh my team is shit so I'll cheer for these guys, oh look mine is good now ya go team." Jays fans have always been Jays fans, or they just aren't baseball fans who cheer for their cities team when they're good (happens everywhere, TO 4th largest NA market, hence we have a lot). Or they're on /r/baseball with a flair for a diff team but live in TO and switched allegiance when the Jays were losing, because they are fair-weather fans.
So are people ranking "which city has the most people show up to games when their team gets better?" Or should it be "which fans have the highest propensity to support another team upon poor performance?" I would define the former as "bandwagon" and the latter as "fair-weather" fans. But then what constitutes "support"? Buying tickets? Watching on TV? Supporting them over other teams? For me it's supporting them over other teams, as I said. A fan is a fan. If someone doesn't watch baseball then all of a sudden has a Jays hat they got from the Sunday game, but then never really talks about the Jays or watches more games, that's not a fair-weather fan, that's a dude who went to a baseball game. But from a business perspective, perhaps they're more a "fan" than the guy who tracks prospects down to single A but can't attend games.
How each person defines a fair-weather fan is up to them, and their rankings will differ depending on how they define it. But the actual amount of fair-weather fans isn't what /u/kcrain7 is looking for; rather what teams people perceive to have the most/least. So arguing over who has more is irrelevant, it's about why people think certain teams have more.
Which is why I commented on the American media, and it's not a slight they have no reason to show a bad Canadian team to Americans. But when they do, American fans may perceive Jays as having fair-weather fans because they only see them when they do well, which aligns with some peoples definition of the term. Obviously Jays are going to have more fans when they do well, that's how sports work. My point is that they don't leave when the Jays aren't good and cheer for other teams. They either just didn't follow baseball to begin with or do so quieter lol Essentially Jays have a lot of bandwagoners, but not fair-weather fans. It's Blue Jays or nothing. I see a distinction between the 2, others do not, c'est la vie.
Sorry for rambling on, I'm not trying to be dick, this is genuinely interesting to me as I just recently finished a marketing degree (not a PhD lol).