The cost of down insulation and the cuben fiber tarp are what I couldn't get my head around. But it wasn't just weight I shaved off, but bulk.
As soon as I had no more bulky pad and bulky synthetic 4 lb. sleeping bag, I was easily able to move from my North Face 90L 5 lb. beast to a 1.5 lb. GoLite Jam 50L.
I still carry too much crap, but two years ago my pack weight was near 60 lbs. Now I'm down to around 25 lbs. and my knees and back thank me for it. You can't put a price on that.