That's the advantage of using a
percentage-based withdrawal, with whatever level of conservative/aggression your tastes demand.
Because we've recently gone parabolic, I've personally started using this format, but putting rebuys, proportional to each sell, below each normally finalized sale.
As an example:
You sell 10 Bitcoins at $100.
Rebuy 4 Bitcoins at $90
Rebuy 3 Bitcoins at $80
Rebuy 2 Bitcoins at $50
Rebuy 1 Bitcoin at $33
This way, without knowing how far up the parabolic rise will go before the inevitable correction, consolidation, and finding of new equilibrium.
You'll never have sold more than you were willing to ultimately part with.
All your rebuys will be for a net gain of Bitcoins.
The weakness is that you'll leave money on the table - there is virtually no chance such a system will maximize profits...but that is not the goal.
The advantage? When the instigating event - whatever it may be - causes the crash to occur...all your rebuys will be in place, and according to a pre-planned, controlled method. You will not be hostage to the inability to change your order book for hours at a time - something that occurred both in the April crash, and most recently, for a few hours on our good friend Gox.
Problem is still determining the top. In your example, say you set your stop order at 100 ahead of time and your rebuys accordingly lower, but price continues to climb significantly higher before it corrects, there is a chance it will never fall deep enough to trigger any of those rebuys. In other words, you missed out on profit (because you sold to early), and you're not getting your coins back. What I'm trying to say is, you would have to constantly re-adjust your stop order and the rebuy levels, depending on how the trend progresses.
