They go down fast just like computer tech because pretty much every year they get that much better. Or at least the marketing side of it is that good.
For example, I had a Hoyt Maxxis 31 brand new in 2010 set at 58 pounds. I bought a new Hoyt Carbon Element 2012 at 65 pound draw. It was 40+ fps faster, quieter, better accuracy and the draw weight felt easier at 65 than the 58 a few years earlier.