I think the idea of the survey/preferences is for them to get an idea what their customers like. I'd much prefer more silver jewelery myself as well, but maybe the majority of people love gold. As long as they don't offer personalization of the boxes, the surveys will only help them satisfy most of their customers, but not everyone.
I just love getting the boxes and the surprise. With every box, there is usually one item or so that's not a must-have for me, but I can gift it or keep it and it might grow on me. For example, when I got that little apple dish, I hated it .. it seemed so kitschy to me .. like something I'd hide in the back of a closet. But, now I use it all the time for my snacks during the day and it makes me happy. (I still think it's kitschy, but it doesn't bother me for some reason).
I sent them an email last week and only got the auto-reply so far. Hope to hear from them soon.