I don't currently qualify for CPS because I do this as a hobby... the guy there said that they'll be changing the CPS requirements soon because more people are going "prosumer", buying 5D or even 1 series bodies even though they don't make a living from it. I'm one of those people.
I asked out of curiosity and he said the only benefit in this case would have been a 20% discount on the shutter part (not labour), which is around $AUD50/$USD45