I will say this now and I will say it again, and I will damn well be consistent about it: consistency is key.
Madness string 1605
As an experienced seamstress, I would say the more experienced the stitcher, the less likely they would want to do it. Those who sew know what it truly involves, and the hours, weeks, months of hard labor that go into a wedding gown, not to mention that quality fabric, makes a huge difference in the finished product and the price.