Anyone selling now for tax losses better understand that they can not buy it back for 30 days or it is considered a "wash sale". The next 30 days could get very very interesting. I would sure hate to be on the sidelines for the next 30 days.
Also, I've heard many times that investors frequenly make poor decisions when they are thinking more about taxes than they are the quality of the investment. This is the same for both loss selling and for gain avoidance. Also, you can only deduct losses up to $3,000.....I would be pretty surprised if many out there have gains this year to offset the CPRK loss.