Quote from turkeyneck:
Bought Shittygroup at $35 (70% equity back then) last Nov and rode it down to $13 and change. LEH and other banks were blowing up left and right on 9/15. I thought C would go to single digit. I feared blowing up my account and sold C at the exact low at a big loss. A margin call at the background didn't help either. A day later it shot up to $20 with the bailout plan and I felt like a total moron. Was it wrong to get out and preserve capital in this scenario?
No. You were right to sell. Your mistakes were:
i) trading too large
ii) having on a position of any size when you did not know what was going on
iii) not selling earlier when i) and ii) became obvious.
Why were you right to sell? Because you had a large position, and no clue what was going to happen. I.e. it was, for you, a total coin flip gamble. If you think tossing a coin on 50% of your account equity is a good idea, then you need your head examined. Therefore it was right to sell all, or at least the vast majority, of your holding. Now if you had sold most but kept say 5-10%, that would be more defensible, but *only* if you had a valid reason. Hoping and praying for a bounce is not one.
The simple way to answer your question is this - let's say a stock has gone down 70% in the last year. You have no idea if it's going to fall further or rally. Would you wager 50% of your account equity on this trade? No you wouldn't. So how is it any different if you already happen to be in the stock?