We have never been to a price without coming back down to at least 50% of it.
That's an interesting claim. I find it impossible to believe, however:
Suppose we hit an ATH, then came back down to 50% of it. Then the next time we went 0.001% past that ATH, in order for the observation to be true, the price would have to hit 50.0005% of that original ATH thereafter. Clearly we have not seen such a revisitation of that level relative to many previous spike tops.
Nonetheless, your point is taken, with suitable qualifiers and parameter changes, and if that pattern were to persist, trading it would be very lucrative.
Correct. I believe we hit 300 and never went back to 150.