<p>There are many reasons people sell cars, especially older ones, that aren’t related to the reliability of the car. </p>
<p>Sometimes people want or need a larger, smaller, or different type (ex: SUV vs. sedan vs. sporty convertible) of car, perhaps because they now have kids, or no longer have kids, or need to drive the grandparents around suddenly, or hit their mid-life crisis (usually guys), etc. and switch for that reason.</p>
<p>Sometimes the cars are coming off of lease (usually 2-4 y/o cars) and the person will pick up another new car lease so this one gets sold as used. Some people simply go from lease to lease and get a new car every couple of years even if their old car is perfectly fine.</p>
<p>Sometimes, many times, the person just WANTS a new car and so when they feel like they can afford what they want they buy it even though the older car is perfectly fine.</p>
<p>Sometimes they just needed to do an expensive repair, for example the transmission, and are fearful of another expensive repair but in reality just because the transmission needs repaired it doesn’t mean there’s a problem with the engine, differential, or suspension. The car may be fine now that the one bad thing was fixed.</p>
<p>I think far and away most people get a new car just because they want something new and different and there’s not necessarily anything seriously wrong with their present car. One person’s discards are another person’s treasures. </p>
<p>I’ve purchased both new and used and haven’t really had any more issues with the used cars than the new ones. In fact, when it’s a bit older it probably has some of the early life failures already fixed, like pesky Check Engine lights. The big advantage to new, but can be had for some used as well, is the warranty so if it does break it’ll be fixed without you having to worry about big additional costs. But you’re not getting anything for free - that’s one reason why new cars cost more.</p>
<p>Good luck with whatever way you go.</p>