We have only 3 pairs in our household.
My main bin is a Ultravid HD 8x42, which I use most of the time.
The other is a Nikon EII 8x30, which I sometimes take for hikes in the mountains because it is lighter. It also sits in the shelf and I grab it for watching stuff around the house.
My son uses a Yosemite 6x30.
I tried a while for a second bin to complement the Ultravid 8x42, starting with a Trinovid 8x32 BN, which I liked but replaced by a Zeiss FL 10x32, because it seemed the better complement to the 8x42. I also sold it because I could not get used to the fast focusser. Then I bought the EII, mainly out of curiosity. It is a nice bin, but it does not get much use, it is just not as comfortable to use as the Ultravid.
So for now, I gave up on the idea of a second bin, as I realised that after all, the Ultravid gives me all I need. I might consider replacing it in a while by a 8x32, perhaps once the 8x32 SF and the Ultravid successor are available. But probably not.