If anything this shows that attendance and income level of the fans in attendance mean nothing towards morale. I would actually argue that it should.
If you have a stadium full of high income fans they less are likely to boo (in relation to low income fans) because many are there for the scene and because it's the thing to do. Lower income fans are more closely tied to the team, probably drunker too, and more inclined to boo at anything.
If you have a stadium full of high income fans they less are likely to boo (in relation to low income fans) because many are there for the scene and because it's the thing to do. Lower income fans are more closely tied to the team, probably drunker too, and more inclined to boo at anything.