At our old house we never had many trick-or-treaters and the ones we did have usually drove themselves. (Our house was on a fairly busy street and the houses were not close together so it wasn't a great place for kiddies to walk.)
Last year it was a different story - we live in an actual neighborhood now.
We ran out of the candy I bought for the treaters and I had to empty what little candy we had in candy bowls around the house. We scraped by. I hope I have enough this year!