Lets see:
Data entry clerk: to take your personal info (and insurance info)
Triage Nurse: to determine extent of injury
ER nurses: to do whatever the Dr wants/needs
Security: keeps the nut jobs out
ER Doc: licensed to poke & prod you
X-ray tec: takes naked pics
Ortho Doc: to actually fix you
Pharmacist: passes the pills so you don't ache
add in cleaning staff, maintenance staff, building overhead, fixture costs (xray machine, tables, ect) and then the guy who owns the building wants a profit (ROI)
The amount billed isn't out of line if you were the only patient they looked after while you were there.
But if you were a car the bill would have been under $1000.00