An organization I'm in offered a "test drive" event of a car manufacturer to its members. Since I have an interest in cars, I opted to go.
The purpose of this event is obviously to promote their cars. However this is a high-end car manufacturer, and I do not foresee I would be able to afford their cars in the near future. I, therefore, have no intention to even consider buying one, I just want to know how it "drives like".
Considering that the car manufacturer needs to allocate resources (cars and staff) for the event, I feel it would be rude to take their offer knowing it would never have turned out to be a customer of them. If the sales asks me "why are you here", how can I reply without being seen as rude?