Your best people don't quit over money
She didn't leave for a raise. She left because she'd spent a year and a half working around one person, and the math finally stopped working for her.
The resignation email landed in April. Senior product manager, one of the 3 strongest people in the building, two years in. The company had offered her a stay package worth a fifth over market. She left for lower base, worse benefits, a smaller title. The CEO couldn't make the math work.
Three weeks after she left, I asked her the real reason. She named one person on her team. She'd been working around him for a year and a half. He missed deadlines without warning. He took credit for shared work in front of leadership. He generated friction she absorbed quietly, because she didn't want to be the one who wasn't a team player. She'd raised it with her manager four times. Four times he nodded, agreed, and did nothing.
Most high-performer exits look like money on paper. Most of them are relationships. The person leaving has spent months routing around one teammate whose behavior their manager chose to tolerate, often the same top performer who's quietly breaking the team. The raise offered at the resignation moment is real money aimed at the wrong problem. She takes slightly less somewhere else because the new place doesn't contain the specific person she's leaving.
Exit interviews bury this. The person leaving has no reason to be specific. Naming names is reference-check risk. "Seeking new challenges" is the safe answer, and HR files it as the cause. The pattern survives. Two quarters on, another strong performer leaves the same team for the same reason, and again there's no data to act on.
Management almost always knows who the corrosive one is. The missed deadlines, the credit-taking, the conflict: legible to anyone watching. They don't act because that person also ships. Their tickets close. Their projects land. The output sits in the dashboard. The damage to teammates doesn't. Until it converts to a resignation letter, the trade looks fine on paper. The paper is wrong. It takes a year to find out.
So put the damage in the ledger before it converts. Ask, in one-on-ones, who each strong performer finds hardest to work with. The answer arrives months ahead of the resignation. A manager who hears the same name four times and sits still has made a choice, the same posture as the manager who can't fire anyone: keep the corrosive one, pay in high performers, one letter at a time.
She wasn't leaving the company. She was leaving the colleague the company wouldn't manage. No comp package closes that gap. Only the manager can, by having the hard conversation a year and a half before a resignation forces it.