Why does Haitong Securities keep recruiting people?

It seems that the bottleneck period of promotion and salary increase for brokers in recent years is particularly serious, and the salary has been seriously upside down. The salary of fresh graduates is actually the same as that of asso who has worked for two or three years. What strange phenomenon is this? One of the reasons is that the company has squeezed out employees who cannot be promoted by realizing upside-down wages. Compared with new employees, the salary cost of old employees is much higher (not necessarily old, but also long-term). Instead of raising so many middle-level employees, it is better to let young employees with strong physical strength be on top, so there will be frequent recruitment.