They aren’t jokes.
They’re true.
Ok ok, I’ll let the interior decorators live (although I still don’t see why you’d want someone else mucking around in your stuff). Consultants and pet psychics (and psychologists) are still dying in Wabbitland however!
I’ll let any non-silicate model-types live too, just to show that I’m a merciful guy… 
As someone who has repeatedly asked myself “Was I high on paint fumes when I choose this gawd-awful colour?”, I give interior decorators an enthusiastic thumbs up. Some people only know what doesn’t work, and it’s an expensive and time-consuming lesson to learn. :o