Also factor in the huge one-time payout and how that's taxed at a higher rate than your normal big-company earnings. I know people who got hammered at Federal + California + special-California/Federal-taxes at 50%+ tax rate, all because the acquiring company decided to close a few days into 2013, when tax rates went up considerably, with special surtaxes to boot. A few days earlier would have cut the tax rate by a lot.
That tax is magnified if you don't pre-exercise for long-term capital gains advantages -- the whole liquidity event becomes straight income.