Why buy another car when you already have one that works? It's not like a car only lasts a year, they last a long time, great anology.
Maybe if you have an old car.
Say an old vet, it's rare, it's one of its kind, it's really beautiful, but since it's old it has a few broken parts, a few things that others don't like nowadays, maybe some rust, some engine problems or whatever.
It need some renovating, some updating.
So you take it to a shop to have them renovate it, fixing that broken radio, make it shine again, maybe put in one or two modern touches like a CD-player or something.
So after a week you go to pick it up.
It turns out that the shop was owned by Xzibit...
Yo ride just got pimp'd!