Overheard co-workers salary info...am I overreacting?

[SparkyJJO]

People that want salaries kept quiet are the people that receive special benefits. Kind of like the way Wall Street works.

I don't get any "special benefits" nor do I even make a whole lot either, but it still isn't anyone's business how much I do make. Why do people feel it necessary to be so nosy

If people want to discuss how much they make and all, fine. But there is no reason that the information must be divulged.