If someone has had, for example 36 cars in the last 3 years (changed every month), then having 36 cars suddenly does not seem like an impressive or relevant number.
If someone says they've had 3 Renault's over the last 36 years, and then wants to talk about the reliability, that's seems more relevant.
Ps: just giving Renault as an example, it could be any car.
I've had quite a few cars over the years but never kept them for long enough to be a reliable source of the cara, uhm, reliability (pun) .