The costs for repairs has often become more expensive than the camera or in fact several cameras besides not everyone has the money to afford good repair.
If having reliable equipment is important, you pay for it. And one cannot be serious without reliable gear, whatever it is. When one looks at the cost of say a Nikon F on the used market plus the cost of a CLA by a competent tech, and compares it to the cost of an F when it was new (roughly 1/4 the cost of a small car) - it looks like a steal.
The alternative is an endless series of dysfunctional cameras.
If you want unreliable crap, spend your money at lomography.