Most companies prefer some attrition to keeping everybody up to date with the crazy run that the software eng market has been in the past 10+ years. Reality is, if your company is good place to work at otherwise, most people won't start looking for a new job only because it could pay 20-30% more. And, at the same time, in many companies payroll is the biggest cost, so if you can keep it lower by that 20-30%, it will have huge effect on the bottom line.