Yeah, I understand that, I think.
Looking at the real football here in Germany it seems that many people support their local team even if it is really bad, but pick an additional team to be fan of that actually wins often, it it isn't a big rival.
So a Karlsruhe fan might also like Schalke 04, BVB Dortmund or even Bayern München, but probably not Cottbus.
But... looking at the statistics the Cowboys weren't even that good in recent years (except 2014). How could they possibly still have bandwagon fans? Are those 80s/90s guys like me?
...wow now you made me wonder if I am actually a bandwagon fan myself.... Partly maybe. AFAIK I picked them because of their logo, but I probably also picked them because I saw more of their games on TV, just because they reached the playoffs regularly.
Oh no, self doubt! My old enemy! Quick, where's the Bourbon?!