We hope for better things; it will arise from the ashes - Fr Gabriel Richard 1805
We have three telephones in our house and really only one person uses them.
Though not a household item but definitely redundant, I have opinions at home but rarely get to use those either.
"I am very good at reading women, but I get into trouble for using the Braille method."
~ Otterpop ~
Well, its taken 5 years, but I think we have succeeded in reducing household redundancy to almost none at the moment. It was partly helped by the purchase of a small cabin and some land where all the derelict and less-than-pristine redundancy went to live. Mostly this amounts to chairs, some kitchen items and tools. Ok, I still have three hammers at home (well, more if you count specialty hammers like your ball peens and upholstery ones) but really, I don't count tools. You can't have enough screwdrivers and hammers in my opinion. And I'm sure there's a smarta$$ joke for that one, so have at it...
Otherwise, we tend to have the opposite problem - not being able to find the crap we need but which you know is SOMEWHERE in the damn house. To make it even more frustrating, the house isn't very large. So, I spend a lot of time walking through the same rooms over and over, talking to no one and saying things like "where the hell could that @#&! chapstick be?!" To use but one example.
The purpose of life is a life of purpose
I'm afraid I seriously suffer from household redundancy: 4 TVs (I'm NOT hauling one from room to room!); 5 phones plus a cell phone; 2 computers; 2 Pampered Chef choppers; 2 sewing machines; 2 stereo tuners/cd players/cassette players; 3 lawn mowers (1 rider, 1 self propelled, 1 hand reel); 3 weed wackers (1 battery, 1 electric, 1 gasoline); 2 grills (1 propane, 1 charcoal), 3 electric drills (1 corded, 2 battery), an unknown number of tape measures, levels, hammers, 3 dog crates, 2 cat carriers ... I'm a sick puppy who doesn't throw out old stuff that works but can't resist new stuff, either.
Some of this stuff spends summers at the camp, too, so I'm sort of into "house redundancy" myself if an 8 x 26 foot camper with electric but no indoor plumbing qualifies as a house (there are some poor people in this area who actually live in not much better).