I would argue that experienced quality - or even serviceable - IT is the absolute minority, to begin with.
There are organizations that aren't one bad day in IT away from starting a company-ending death spiral, but they're not typical.
Many CEOs and HR professionals underestimate that risk, but that underestimation is a self-correcting problem over time.
IT professionals may lose the current opportunity by negotiating, but their next opportunity isn't (statistically) far in the future.
As a bonus, employers who are averse to having IT employees negotiate tend to be lousy employers