It's a really interesting subject this. As I said at the start of the thread, it is SO hard for us as DJ's to be completely objective about our shows - we love the lighting and the gear, but when you actually listen closely th the clients the story is very different.
We did a 13th birthday on Saturday and while there was a little "wow" from the mother when we wheeled the kit in, the main praise afterwards was how enjoyable it had been, how the kids had been dancing all night and how thrilled the birthday girl was. The mother even commented on how right I was that sometimes you have to pay for things to get something great!