Isn’t it their job to put it on you? My understanding is many people bring in designs. That’s the easy part that is so replaceable, whereas needling someone’s skin is not strictly ai replaceable quite yet.
It depends on the person buying the work I guess, but most tattoo artists that I know wouldn't be overly happy with being given an image and asked to just tattoo it.
It's wild that this is a thing when the tattoo artists job is literally to create the artwork for you