The company I work for makes all salaries and bonuses visible to anyone in the firm. Salaries are simple, there are only 3 bands of salaries. Bonuses are base

The company I work for makes all salaries and bonuses visible to anyone in the firm. Salaries are simple, there are only 3 bands of salaries. Bonuses are based on the firm's and employee's performance as well as a multiplier based on how much salary they took. Smaller salary, larger bonus multiplier and visa versa. The system works pretty well and I haven't noticed any negative consequences from having this information internally visible. Maybe if we get above 100 people at some point this will break down? Serious question to others... What's the downside of having your fellow team member's know your salary?