All of the shows I've been to as an exhibitor there were strict rules about exceeding your space. Assuming you use a standard 6' folding table, they're 30" wide, minus the width of your background, now your down to only roughly 2-1/2' of actual floor space on depth. You could use a 4' folding table which generally run smaller at 24" wide, but that still doesn't gain you much. Even if you take out the table and everything else you're roughly 5' x 7' actual working floor space. We generally assumed a minimum of 4' for personal space between us and the customer while talking to them in our booth, any less and you were invading their personal space, making them uncomfortable. If they're uncomfortable they aren't listening to you. Now when you put a table at the front, and work from behind it, you've accomplished two things - 1.It becomes a mental safety barrier for them, allowing you to work closer without making them feel uncomfortable, 2. You effectively increased the floor space of your booth out into the isle. Just my thoughts from the past. One other thing, extremely important, - "wear comfortable shoes". Just the memory of all that standing made my back hurt.