So if I buy Yoshi's Island, is Yoshi's Island's sales success something that you would find right of me to attribute to me as well, saying "We did really great on Yoshi's Island"? If someone is actually official member of a team, I can see grounds for a "we", even if it is stretching it. If someone is merely a fan, then there is no proper basis for a "we" however.
Being a fan in a lot of cases makes you a member of the club. When you are a member of a club you are affiliated in such a way that saying things like "we" and "us" are completely normal.
Videogames companies are not clubs, they are corporate entities. So unless you own or are a part of said corporate entity saying things like "we" is horribly misguided. It's an important distinction to make.