My grooming shop doesn't have a receptionist. Whomever is closest just walks out front to pick up incoming dogs. Drop off hours are only from 7-9 am, and pick up is generally only after 3 though, so for almost 6 hours there are very few interruptions.
I agree with the idea of hiring an extra set of hands, but not giving the person the title of receptionist. Can they be the sweeper, the greeter, the bather, the phone person, etc? And yes, I would think they would absolutely get part of the commission, if they're making your jobs easier.