The reason the bleachers dropped is due to the fact that he lost his previous game. Losing games will mainly affect the amount of people that buy seats in the that section. If the prices are right and your team is doing ok then lower tier, courtside and luxury will sell fine. Bleachers drop when a team lost or is losing there previous games. It's in the game manual.
"You will find that the people who want the most expensive seats will pay their money win or lose (but care a lot about ticket prices), while the less expensive seats are mostly filled by rabid fans who will show up when the team is winning but won't pay to see a losing team." - Quote from the game manual.