From the game manual about arena:
"The happier your fans are, the more of each type of ticket they will buy,..."
From the game manual about fan survey:
"When BuzzerBeater fans don't like the way you are running your team, they are less likely to buy merchandise and attend your games...."
"Questions 4-6 ask about the team's performance in recent games. BuzzerBeater fans are notoriously fickle, and their opinion of your team can swing dramatically on the outcome of a single game..."
I have to disagree on that point with you. Of course losing games causes lower attendance, but further, the fan survey is a way from BB to make things more transparent for the user. It helps us to understand why we have high or low attendance during home games and gain more or less money with merchandising.
I do agree with you that winning games in general is the most important thing to get high attendance, and it is not too bad not to have a high rating in every single category of the fan survey.