QFT.
Most costs an IT department has is Body's not gear. You get the write off hardware over a 3 year period for a business expense..You have to pay taxes for every person on payroll.
Think of it like this: average Business Dell (office, dock, monitor, keyboard and mouse) runs you $1300 which you keep for 3 years. 1300/3 = 433.34 per year. Low Level IT Support desk starts at 30,000. 30,000/433.34 = 69 laptops per one person salary. That doesn't include payroll tax or insurance.
Most sites have 1-2 techs and one manager per 3-5 sites. Managers make 60-80k. If your big enough you have domain guys and network guys that your paying too...they are much larger salaries...100k+ easy. See how quick bodies add up.