An "all CRT is equal" mentality can only hurt patients. Just as there are therapies that are more or less effective for a particular condition, features, build quality and performance vary in our world as well.
Those of us who test to standards, inspect materials and products before shipping, and refine designs as technology permits, will always have to charge more than someone would pay for generic commodities. It takes more people to do what we do.
But for a device, accessory or component that provides mobility, safety, function and comfort, all day, every day, paying a few dollars more for what works best seems just as logical [or more] as paying for the coffee, Internet provider or pet food that best meets someone's needs.