So half of this is subjective, easily able to individually say we can’t see a need but someone else.
So trying to restrict to what I can’t imagine ANYONE would want, well:
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the diffuser. In houses which have background aroma being put in the air it makes me feel ill and I am trying to not breath and leave as quick as possible. I think they are for people trying to solve the problem the wrong way.
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vacuums - crowded market
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rebo-vacu. Just use a vacuum, plus I don’t keep the house that tidy the robo vacuum could do that decent a job anyway.
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lamps - crowded market.
There is a little of the OCD in Anker’s imagined customer.