I have less than twenty. All I ever need and then some. I have managed to give away a few to family, and several are out on a long term loan basis. Still enough left to have a few extras if I'm hauling family and friends out to bird. At least in theory...
My need for eye relief really limits what works, which is probably a good thing, otherwise I would've gone down a bigger rabbit hole to sample older bins out there. (Habicht, Nikon E series, Zeiss HT, Fl, Swift Audubon, etc. )
The ones in heavy rotation for me are:
Zeiss 8x42 Victory SF
Leica 10x42 Noctivid
Swaro 8x32 NL
My wife uses:
Zeiss 8x32 Victory - I barely can't see the entire field, but an excellent bin otherwise
Swaro 8x32 EL - I also use this one. Great all around bin.
Leica 8x32 UV plus : Love the size, but not enough ER for me.
Hiking/Backpacking:
Zeiss 8x25 Victory: Too fussy for me for regular birding, but great for hiking with.
Astro:
Canon IS 15x50: Lousy ER, and even the IPD is not great for me. I got it years before I began birding, when I was more into astronomy, as a widefield supplement to a telescope, but the IS is a wonderful tool when stargazing. Use without glasses....
Periodic car and walking bin:
Nikon MHG 8x30
There's a few more sitting in their pouches, probably wondering why they don't get used...
-Bill