Lamborghini is popular because of the cost and the exclusive features it carries. They are not produced in large quantities like most automobiles manufacturing companies do. Parts of the features of Lamborghini are hand assembled which gives room for less errors.
There are companies that make parts specifically for them, everything in a Lamborghini is of high quality.
Lamborghini can be customized to your taste, you can choose the color you want, how you want the interior design and many other things can be customized for you. All these come at a price. To purchase one, you will spend quite a lot of money.
This machine is associated with wealth. Since they are not common (because of their price) and they are not produced in large quantities, these make them unique and popular.