we use to get off work at midnight, and we would go out to the causeway on the local lake. There were several cat fishing holes which were commonly used. If we found one that still had a smoking campfire we would move on.I often hear people say what you said, "...until it does not work anymore". If it stopped working it could not have been based on the basics of price movement, could it? So it was not really a high probability, sufficiently tested, sound edge that could be expected to last forever. I would guess that the farther one deviates from the basics (gets far out on the limb), the greater the chances are of eventual failure, but not necessarily due to changes in the markets on which most seem to blame it.
Nobody leaves a good cat fishing hole until they stop biting.
Nobody abandons a trading strategy until it starts losing money. And you don't know it has quit working until you have lost more money than you think you can recover doing the same thing.
