I suppose you can make up a story for anything. How is that different from purchasing any small Batman collectible and placing it in front of her as a target? Would be cheaper than the EX.
Well yes and you could also purchase a Mattel Cheetah figure to stand opposite Sideshow's Wonder Woman but it's nice when separate collectibles compliment each other by being perfectly scaled together and made by the same sculptor, materials, etc.
If you don't like the bat-in-the-box then obviously don't get it but I see what they were going for and find it to be a pretty clever addition.