Yes, you have to eat. That is why you bring enough people to be able to rotate for down time. Make sure that you enough sales information. But also make sure that it is properly identified with your corporate and contact information for further inquires and follow up. This is especially important if you are a distributor displaying like materials and services to other vendors at the show.
Business cards are cheap.
Four color sales literature can be expensive. If you have to make judgements about what to distribute to whom. But make sure everyone gets a business card. I've been to many shows. The one thing I've learned is that I don't read people well.