Yes, but that's an insanely small minority of people. The average person in my hometown makes $70K a year with overtime and has a $320K house. They're not loading up IRAs. They don't have the money to spare.
My point is it’s better for the employee who is getting paid a lot (whether it be oil and gas or tech) to receive their compensation in fully liquid cash they can invest in a broad market index fund, rather than have it be held hostage (see agency risk). Plus the employee maintains more leverage to be able to sell their labor to other employers.