They still go in the show, but can only be won in the voice auction, I'm sure they're raise more that way.
We've thought about this, and in fact, a few years ago, we had quite a few charity items that went straight to the voice auction. However, that causes a problem: Unless we make the charity auction a separate event, we'll run into serious timing issues. The auction is already taking very long, and the time we have on stage is not unlimited.