It's because I am shipping priority. I cannot ship based on weight because then I would have to supply a box which is an additional cost for me to then charge in addition to the weight. it's more simple this way. I think for a pair of $60+ authentic us that were barely used it's still a great deal.
I just realized I can try to fit them in a priority stretchy envelope, which would be cheaper! I will lower shipping. I only take PayPal for payment so, please note that it will include the fee from PayPal (which is minimal like $1)