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Counteroffers once an employee has mentioned a plan to leave are so fraught with morale issues that many managers recommend against them no matter what. And auctions suck for buyers due to the "winner's curse" – wise buyers will often try to avoid being part of an auction process.
Does that mean the seller always wants an auction, highest price always being best? Maybe if you can sell-and-forget a physical item. But selling your unique-in-the-industry talents for the next N years isn't quite like that: it's a relationship where you'll need a full gelled team and other costly resources to do well, and some safety margin for miscalculations. A 'cursed' winner who overpays for you, and others, might wind up sinking your projects and career when the errors manifest.
Pixar employees have done very well, overall, including through stock options which became more valuable because their teams stuck together, and delivered critically-lauded and highly-profitable work at sustainable costs. Perhaps an alternate-history, with more talent raids and compensation bidding-wars, would have led to some superstar employees making even more money. But it might also have torpedoed key projects at key moments, and left the company and the bulk of the employees, far worse off. It's not a simple situation to model.