Pardon my wording but; how little an amount of money [that you would be able to give them] would you deem too little an amount for a gift?
As in-perhaps you could only spare $20, is that too little an amount to put into a card? Is $50 too little? Where do you draw a line?
Even if they only wanted money, would you consider getting a nice gift because it would look nicer than a small amount in a card?
What do you get someone who says they only want money?
DK/DC: how long ago was the last wedding you attended?