I have done both a VIP and regular deal and I think my VIP deal did much better. Not only did people spend a lot more over their amount with VIP only but I didn't have to eat the extra $10 and when I did a regular sale, I only sold 30 more vouchers than when I did a VIP only and most of those were VIP's where I was having to eat the extra $10 for every order. Of course, it depends on a lot of variables like other people were mentioning. What other shops are featured, what your price point is, etc.