I'm curious to know on some of the really intricate cookies made the time spent on them, but in saying that I think a lot of those type of cookies are done as a labour of love and the artist is not necessarily watching the clock as they decorate. As for pricing I think this is a subjective thing, especially when you take into consideration the skill level of the decorator. I know how you feel when you compare your work with others and can feel overwhelmed by the intricate pieces of art we see, but I think putting a price on those on this site could possibly invite negativity. As I said pricing is subjective and what one person is happy to pay another may feel is very exorbitant.
I see what you mean...I hadn't thought of it as inviting negativity. To me, the art I see on this site would be worth whatever the creators charge! I just think that knowing what those kinds of cookies go for, assuming they are even made to sell, would help me keep my dinky little cookies in perspective. For example, knowing that a particular intricate cookie was sold for $10, might make me feel better about my imperfect, simpler design that I sold for $3. I guess it's all about comparison -- I know we shouldn't compare our work to others', but it seems to be human nature to do just that.
If you are struggling with pricing your work then the model that Julia refers to above on this site is a great starting point. There are also other bloggers out there that have broached the subject, namely Sweet Sugarbelle. Search her site for a reference guide. But as I said it's all subjective and if you have customers happy to pay for your work then continue to build on that and try not worry about comparing yourself to others too much I know it's hard believe me, I'm the worst but I really try to make it drive me to do better and challenge myself and of course still remember to have fun cookieing!