Yep, my mate Davey Dobinson bought a shiny new CB750K2 in 1972 and commuted/toured/raced it during his university years and it was his sole source of transport when he was a teacher here in Melbourne, until he finally bought a car in the 1980's.
His family lives in country Victoria, so he did hundreds of weekend rides to see them in all kinds of weather, and he had the first set of "waxed cotton" wet weather gear I'd ever seen, at the time. He did lots of interstate trips too, like his yearly trek to Bathurst for the Easter TT races in the 1970's and 1980's.
By 1980, when I started hanging out with him, his bike had done 109,000 miles, and had never been apart. Davey did lots of miles, but he never rode more than 2000 miles without an oil and filter change, and that bike felt "gruntier" than my (then) recently rebuilt K1, or his brother Pete's mint low mileage K2. Incredibly, at 109000, he was only on his second set of chains and sprockets, but couldn't remember how many tires he'd gone thru. He'd installed a Martek ignition when they first came out because he was sick of messing with points, but apart from that and some aftermarket pipes, he'd kept the bike pretty much standard.
Pete fell off Dave's bike shortly afterwards, and the fins on the cylinder block and head were mashed, so were replaced as part of the insurance work, and Dave forked out for new pistons and rings, but up until then we were sure that bike would have done 200,000 without any engine trouble. It was truly a case of one of those bikes that nothing ever went wrong with, and it felt so good to ride.
He's still got the bike, (although I haven't seen it for many years since he moved to Cairns, in Far North Queensland) and has amassed a great collection of NOS "cosmetic" parts (original blue tank, sidecovers, seat, pipes etc) for when he eventually takes it off the road (it's been continually registered for the last 36 years) and does a "cosmetic" restoration. Cheers, Terry.