Sorry, but that's a terrible argument. If you're going to do a trick, it has to make a little sense, or the spectator enjoys it less.
Magi: Alright, here I have the 5 of Hearts. Watch as it CHANGES from that to the 7 of Clubs. Oh wait, nevermind, here's here's the 5. Guess it didn't change afterall.
It just cheapens the trick. The spectator automatically knows that the card didn't change, and that you just switched it.