[oilbreh]

I think its very company dependent. Think its been mostly pointed out already but there quite a bit of paperwork and processing you need to do. Health Insurance, Benefits, Deductions, 401k's, Background checks, Tax forms. Constant government changes to all this at federal, state level and city . If a company has a high turnover rate and is in the 50-200 person range you pretty much start needing an HR person to do and keep track of all of that and avoid any fuck ups where you can be sued.