I think it depends. I guess if I were a potential client I could look at an agent who drives a high priced vehicle as either being successful or charges too much for services.
In our area, agents tend to drive vehicles (4x4’s) that allow them to get into areas during the winter that regular two wheel drive vehicles may have difficulty. Although there are fewer home sales in the winter, an agent has to give the potential customer the idea that traveling during the winter is no big deal. If the agent is driving a car that gets stuck in the snow, the customer can get turned off by the area because the customer may not want to invest in a new car. When riding with the agent, the customer doesn’t really even think about how hard it’s going to be for them to get around.