Context is everything. We're talking about desktop computers. We already know laptop users dwarf desktop users these days. My question implied I was curious about what percentage of desktop users use iMacs. 70%, even for a product that isn't widely used, is interesting.
Mac sales are pretty good relative to the overall market.
iMacs are almost definitely a minority compared to laptops (Apple doesn't break out sales by model), but since Apple is selling somewhere north of 10 million Macs/year, there have to be several million iMacs in active use.
Love my 5k iMac I bought 2 years ago; it replaced a 10 year old Mac Pro when I just couldn't justify the pricetag of a new computer AND display separately, with the 5k iMac starting at just $1800. Friend just bought an iMac Pro. My mom's still going on a 20" iMac from, I think, 10 years ago. I replaced the hard disk with an SSD at some point, but I can't even remember why -- possibly just to give it a performance bump. I know the disk didn't outright fail but it's possible it was making noise.
Not the GP, no source, but anecdotally, I see lots and lots of design related offices around London littered with iMacs everywhere. Dunno if they like them, but they certainly use them.
I have a 5k iMac. No real complaints with it, although the design is pretty dated with its massive bezels and huge chin. Compute-wise it serves its purpose for me, good performance for an all-in-one.