It is not about playing a role. As a dialysis RN, there is a great deal of autonomy. You have to be able to think on your feet and know what you are doing.I am not saying that they should be paid what a tech is paid but to think that a new nurse out of school should make the same amount as an RN with 18 solid months of experience is not really feasible.
The RN has to know the water system, medication,labs,fluid, electrolytes, and lab values. They really do not teach that in nursing school. They showed us the unit and we kept on going.
I have seen RN's come in and not know anything about dialysis. They are immediately paired with a tech, to get the hands on training.