Ya, I probably personally wouldn't have spent more than about $400-$500 for those when I was considering 1/2 tons. As soon as you snap one of those spendy shafts, they add up to the cost of a 60 real quick. Plus, over the lifetime, a 60 will be less maintenance. And putting any money into a rear besides a 1 ton is kind of silly. 14 bolts go for free occasionally on Craigslist around here and are so much stronger than any smaller rear end.
On the other hand, when I was doing the half-ton thing, I probably would have paid around $100 for any one of those components over the years. I'd be surprised if you couldn't make more parting them out. That is, unless you find a guy running a CJ or Sami (I think) that needs a stronger set of passenger drop axles. Around here, everybody wants drivers drop, so you can't give away 1/2 ton GMs.