is this reasonable?

i have a brand new item (in packaging) listed for $30, sent them an offer of $27 (10% off) and they countered $18??? for context i am from australia so all buyers need to pay is the item cost and the shipping, tax is already included.

i have a brand new item (in packaging) listed for $30, sent them an offer of $27 (10% off) and they countered $18??? for context i am from australia so all buyers need to pay is the item cost and the shipping, tax is already included.