I had a GS for 17 years. Sold it 5 years ago as it needed some pretty expensive head and maybe transmission work.
Then last year bought another one as an easy project believing some of the BS the mechanic/PO fed me.
Not worth fixing, price of parts is through the roof and yes they do fail expensively, had more than a few of them "expensive" failures in 17 years.
Now I use the K1200RS as an ADV bike, another one that's expensive on maintenance but funnily enough, I take it to almost the same places I used to take the GS. Even funnier.....don't see too many of them newer GSs there.
Looking for a big ADV thumper now, probably won't be a KLR but Eh!......you never know.