I think some people only prefer to drive other peoples car because you don't have to bother with service, insurance, general maintenance, talking about the car's history etc.
Be very careful with other peoples cars. One day someone might actually decide to give you his car to keep permanently and that is the day everything will turn upside down! You will realize that the car is worse than yours, is a guzzler, might be fitted with Taiwanese or Chinese parts etc na utajuta mwenyewe.
Stick to your car! Someone might be busy driving you Range Rover Sport as you are busy chasing mtumba Duet, Vitz, IST, March etc. Ni hiyo tu.
Never count on making a good sale. Have the purchase price be so attractive that even a mediocre sale gives good returns.