Though 11mm arbo lines (Fly, Velocity, and Blaze so far)could be considered "high tech" their prices can remain competitive with the 16 strands ropes like XTC and Braided Safety Blue. The biggest reason for this is that there's simply less rope, less material in an 11mm line.
In my eyes, it is reasonable to pay a bit more for the 11mm considering all the planning and research it takes to put a new product on the market and all that jazz...but that's for other people to decide!
I started climbing on Blaze 6 or more months ago and I love it. Yes, the half-inch lines are bigger and easier to grab on to, but put on some smurf-gloves and enjoy the ride! It's a pleasure hauling around less weight! My 150' Blaze weighs less than my 120' XTC.
The 11mms aren't for everyone, but they sure are nice!
love
nick