Wow, just recently I was looking up all about spider silk, thinking we weren't utilizing it to its full potential - whether medical, military or even fashion. Very excited about this, though it will probably be extremely expensive.
All new breakthroughs start expensive, though. Not until economies of scale come in does the price get driven down.
Don't forget technological advancements, the other price driver. They're 11 years into the research, there could still be huge changes coming in how they can produce it.