A hypothesis!

Now test it, and share your results!

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I don't get why you're so feisty on this issue.

Clearly, dust accumulates where people are not... as dust is a measure of particulate size, nothing to do with humans.
We're not talking about dust in random non-occupied places, though. We're talking about homes in use by people.

All I'm saying is that it's plausible to me that in some houses there are significant human skin cells, dust mites, and mite excrement in the dust to account for a majority of the mass of dust.

Your assertion that this is never the case is strongly worded and requires a strong demonstration of fact to change my mind.

If your sense is so common, it should be easy to conclusively demonstrate your assertion.