The difference is nothing, but you'd be surprised how many people look at a price of $9.99 and think it is under $10 instead of rounding up.
ຄວາມແຕກຕ່າງແມ່ນບໍ່ມີຫຍັງເລີຍ, ແຕ່ທ່ານຈະຮູ້ສຶກແປກໃຈວ່າມີຫລາຍຄົນເບິ່ງລາຄາ $ 9.99 ແລະຄິດວ່າມັນຢູ່ພາຍໃຕ້ $ 10 ແທນທີ່ຈະເປັນຮອບ.