Some extraordinary decisions are being made at Levi’s Stadium, even if they aren’t coming from the struggling San Francisco 49ers’ coaches and players. In the aftermath of a violent fan beating following the season opener last month, Santa Clara Mayor Jamie Matthews sent out an email to season ticket holders, who are required to purchase a Stadium Builder’s License (SBL) before they can buy actual season tickets. It’s just one of many cash grabs sports franchises have invented to extract every last dollar from fans after building a new stadium. As mayor and chair of the Santa Clara Stadium Authority, Matthews warned that the city would “remove anyone from SBL Membership whose behavior endangers others,” even if the tickets were given or sold to “guests” who misbehave. The message came as a surprise not only to some season ticket holders, many of whom hedge their investments by selling off tickets to games they don’t want to or can’t attend, but also to some of Matthews’ colleagues on the council. He apparently did not consult his peers before the email blast, sent two hours before the second of two public meetings to review security and alcohol sales at Levi’s. The subject also did not get raised during that meeting, and a few people are miffed about being left out of the process. According to acting city spokesperson Jennifer Yamaguma, who consulted with City Attorney Richard E. Nosky, only one season ticket holder has had their SBL revoked for bad behavior, but it’s not clear if the you-are-your-brother’s-keeper policy complies with industry standards. “We’re still looking at that issue on how it would unfold for the end-user,” Yamaguma said. Matthews did not respond for comment, but considering how bad the Niners have looked to start the season, this may be the next fight for ill-tempered fans.