Again, what they charge and what they get reimbursed are 2 different things.#3 is exactly what I am talking about. It is not because they have to wait, they charge twice as much becasue they can. The insurance company will pay them becasue you pay for it with your insurance premiums.
Look at your EOB. DR visit is $60, insurance payment is probably $30, the remainder (minus your co-pay) is written off.