Shipping Charges

Hi,
 I have a quick question about the cost of the shipping charges. When multiple trucks are purchased, members are charged $10.00 a piece for shipping(no matter how many are purchased!). Anyone who has been collecting these  knows that  normally, when you purchase multiple items from the same seller, they combine shipping costs. That ALWAYS turns out to be less than $10.00 for each item. Past Time hobbies only charges $5.95 for shipping, no matter how many pieces you purchase. Troys Toys also only charges approximatley $2.00 for each additional item purchased. Why is code 3 charging so much and where is all the extra money going that is not being put towards shipping? I am a club member and think that this is unreasonable. It does not cost $10.00 an item to ship if you are shipping more than one item in a box! Thanks