Agreed.  My understanding is that the Supply Zone remains valid until tested and broken.  I think the reason for this is simply a self-fulfilling prophecy.  Technical Analysts are taught that these levels matter, so they react accordingly.  Algos are programmed to react to these levels.  So IMO it is less that actual individuals held for 6 years to get to break even, and more that traders and computers are making decisions based on that assumption, faulty though it may be.  Once selling begins, the resistance level is confirmed and others pile in, even if they aren't looking back that far.