Is it sonic enough?

My daughter was playing around with the uber-coolness of my Three-styled toy sonic screwdriver (the cat takes suprisingly well to being sonicked) and had to ponder - "Why don't they make them with something like an end that comes off and inside would be a real screwdriver that you could use to twist things with, you know, so it really does something? I would totally want to make something like that."

"They have a real marketing opportunity there," I noted, "for instance, they could put out the Jackson Lake version of the sonic screwdriver and charge a mint for... a screwdriver."

"I would buy it," she nodded. "That would be so cool."