In general the most common statement I hear is "signed cards are worth as much as someone is willing to pay for them". Assuming the card is not one that is uber rare e.g. No.1 trainer card or something ridiculous like that, would anyone's signature really add the value that much, just in your (reader of this thread) opinion. Obviously be within reason, this includes any previous world champs etc, artists/creators (i.e. the ones who go to worlds Sugimori, etc) Thanks, I'm interested to know opinions.