This point is raised on the video that comes with with the effect. It
is a fair one but the reality, I think, is that this is just a
fantastic comedy routine although it comes down to what you feel
comfortable with.
I really believe that no client would have a problem with this effect
being performed, and I do not know of any example of someone raising an
objection to this effect afterwards. It is just a great, magical, fun
routine that has made its way into the repertiore of many professionals
worldwide.