Additionally, from a commercial standpoint, many endeavors were built with a specific BTC/$ value. If you built out a large mining operation based upon $500/btc you are bleeding and will probably shut down in the near future. However, if you bought a miner for your home and are running it, you are dancing in the street. You can watch the $/btc rate jump from $100 to $1000 and back to $100 and afford to keep hashing. You can hold pretty much forever, unlike an ongoing major mining concern. And when the difficulty steadfastly refuses to increase, the life of your gear just got extended, and so does your ROI.