Plenty of people buy secondhand equipment. Manufacturers want to stop that; spare parts are hard to get or needlessly expensive, and manuals are woefully incomplete or nonexistent.
I've contracted for someone whose customers thought so. (My job involved making stuff work with without an important part from a defunct vendor.)
Their costs really did increase all the time. Not needlessly, despite what some people thought: their cost per spare part really did grow quite a lot, as the number needed per year decreased and the fixed overhead slowly increased.
And consumer. Very few people would use 50 year old devices even if they were/are perfectly functional.