进口车之所以贵，主要是由于以下几个原因：

1. 成本高：进口车需要支付关税、增值税和其他相关税费，这些费用都会增加车辆的成本。此外，进口车还需要支付运输费用和保险费用，这些费用也是由消费者承担的。英文翻译为High cost: Imported cars require payment of tariffs, value-added taxes, and other related taxes, which increase the cost of the vehicles. Additionally, imported cars require payment for transportation and insurance costs, which are also borne by consumers.
2. 品质保证：由于进口车经过长途运输和海关检验，品质得到了更好的保证。同时，进口车的制造商通常会提供更长的质保期和更完善的售后服务，这也增加了车辆的价值。英文翻译为Quality assurance: Imported cars are transported over long distances and undergo customs inspections, ensuring better quality. Additionally, manufacturers of imported cars usually provide longer warranty periods and better after-sales service, adding value to the vehicles.
3. 税收政策：政府对进口车征收的税费较高，这也增加了进口车的价格。此外，一些国家还对进口车征收额外的税费，如排放税、环保税等，这些税费也增加了车辆的成本。英文翻译为Tax policies: Governments levy higher taxes on imported cars, which increases their price. Additionally, some countries also impose additional taxes on imported cars, such as emissions taxes and environmental taxes, which also increase the cost of the vehicles.
4. 品牌形象：进口车的品牌形象通常比本土品牌更好，这使得消费者更愿意购买进口车。这也使得进口车的价格更高。英文翻译为Brand image: The brand image of imported cars is usually better than that of local brands, which makes consumers more willing to purchase imported cars. This also results in higher prices for imported cars.