There's this 3-day boutique I've been doing for 3 years. It's a centralized cashier show, so I don't have to collect money, and it is not even required that I be at my booth. The first year I did it, I was at my booth the entire time "selling" and chatting up my customers, and I did "ok". The second year, I was more relaxed and took more food and bathroom breaks...was gone from my booth more, and I doubled my sales from the previous year...hmmmm, how interesting I thought. The third year, I did a little test and left my booth quite a bit but stayed close enough to see what was going on. Every time I left, people would flock to my booth, but when I returned to offer assistance, they left. Lol! Again, my sales doubled what I did the 2nd year. Now, I simply say, "Hi! Let me know if you need any help."