People usually stick with one brand of car for various reasons. First off, they've developed a sense of trust and reliability with the brand, especially if their previous experiences have been positive. They also appreciate the familiarity and comfort that comes with knowing the brand's features and functionalities. Loyalty programs and incentives offered by the brand can also play a part in this decision. Lastly, personal preference, influenced by factors like design, performance, and reputation, can significantly sway a buyer to stick to one car brand.