Most people find unwanted noise irritating. I'd rather hear my music than my computer. I'd rather hear my TV than my computer. I'd rather hear nothing at all than my computer while I'm sleeping or doing anything, really. I believe the majority of people feel this way, even.
You're lucky to not be bothered by your computer's noise although I do find it hard to believe that you can run a vacuum cleaner 24/7 and not be bothered by the noise. What's particularly curious is that you don't understand how the noise can bother other people. It's like asking why people like small portable music players. My MP3 player can be the size of a brick and I wouldn't care!
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