WHY? Don't you know that (a) the government is still supporting this puppy, and (b) the time to buy is when there's blood in the streets. I remember well, when Chrysler back in the Lee Iacocca days was selling for around $2. Iacocca persuaded the government to loan (bailout) Chrysler. Eventually Chrysler climbed way above it's $2 share price, the government got some or most of their money back, and some investors with balls of steel, made millions buying up Chrysler when it was basically a penny stock.
There are no GREAT gains, usually, unless there is some significant risk involved. If you have a tiny account or are a newbie, I wouldn't recommend C until it's over $5. But if you are experience, have balls of steel and can afford to lose some pin money, go for it. You'll probably laugh all the way to the bank (pun intended).