Payroll isnt quite that simple though. It takes manpower to make sure folks clocked in and out correctly, for instance. There are automatic deductions beyond taxes - everything from health insurance to pensions to work shoes (seriously). Sometimes child support or other legal things. So many complications.

Heck, banks won't even let you have the money immediately when it is on the weekend or a holiday.

There are real costs to processing payroll more often, even though checks are not printed as often.