If you don't understand causality, then yes it would be strange. It doesn't surprise me that most magicians still fail to consider that it's not the incidental prop that's suspicious, but them.
After months of watching some fellow magicians perform ive come to the conclusion that this is the sole reason the cards are suspected. Because the magician himself/herself looks suspect.
My acquintances,like everybody else,always first perform with cards.
And the reason some of them get asked if the cards are "trick cards" is simply because they dont look right holding them. They dont look like magicians or have a look of confidence on their faces. The cards in their hands look so out of place with them. So in turn,they assume your amateur who has no real skill yet and has to rely on trick props.(this is laymen thinking,using props makes you no less of a magician than if you were a move monkey)
Namely their wardrobe is terrible. They think the jeans and shirt look david blaine uses is going to make them appear street guerilla magicians.
What they dont understand is that blaine has a natural presence that they dont.
Its the way he is,not his tricks.
But what am I proposing? A change of wardrobe or presence? both?
I wanna see where this goes...