that's an exception, not a rule, for sure... if a staff member of mine was doing that, they aren't a staff member long, or if I'm feeling nice, they are just switched to a car allowance and the demo option is no more.
demos are a tricky ground... some demos have no more kms than a "new" car. the kms don't matter so much as the ownership. if it was in a persons name with the licensing, it's used. if it was in the dealers name, it's a demo.
sometimes banks offer a special demo rate on financing, so you can get a slightly higher rate than new (or lower than used, depending on how you look at it). so that part is negated. many manufacturers still qualify the vehicle for the new programs, so in many cases, showing up like a regular new one on a bill of sale (with freight and all that) is perfectly normal. the end number is what matters. I have some demos that are 500 less than the exact same brand new car, and others that are 5k less... totally depends.
also, worth looking into is special demo warranties, or "top ups" that many brands offer. they aren't very expensive and give extra peace of mind... i usually hold that as my close on a demo purchase... i'll throw it in at my asking price to make the deal happen. in many cases, it makes the demo have more coverage than a brand new, and you still get the price break!