some of customers are like this ,don't worry ,i always meet these problems ,just relex and try your best to quote for them,give some advise to them ,and some day you will change this situation.....Bless you ~!
The probable reason that your customers don't reply is that they most likely are still in a state of shock after reading your shipping costs!
I inquired into buying some playing darts. They were about $12.00 for a set of three. But the postage quoted was $550.00!!! Then for every extra set of darts, the postage went up another $550.00.
I could fly to China by Qantas for the shipping price that I'd be charged for one small set of darts - weighing approx 300-400 grams.