toyman wrote:To entertain children, there should be one succer effect in your show.

NO!
It has to be fun.
This can include sucker effects, but they are NOT a MUST.
You don't say if you make yourself the butt off the sucker effect.
Sorry, but from your post, it seems like you make them the " victims."
I DO use sucker effects. My favourite at the moment is Hippitty Hop Rabbits, where they play tricks on ME.
Entertain for laughs. Entertain for the children to be enjoying themselves while you are on stage.
Leave them with the feeling that they have had fun.
Sucker effects are one of the ways of doing this, as long as you don't make THEM feel or look silly.
I would be interested in what effetcs you do and how you use them, as you have only given a little information.