The people making a lot above average (because they negotiated well) generally don't want to share this publicly, because others will realise they are then being underpaid.
As an example: would you tell a colleague "on the same level" as you that you're making $300k, when he is making $50 or $100k? That's either 1) an excellent way to get fired, because now everyone wants $300k, or 2) an excellent way to piss off your colleagues. They will start looking for a new gig immediately.
As an example: would you tell a colleague "on the same level" as you that you're making $300k, when he is making $50 or $100k? That's either 1) an excellent way to get fired, because now everyone wants $300k, or 2) an excellent way to piss off your colleagues. They will start looking for a new gig immediately.