In 2017, an investor who bought Bitcoin at $5,000 in January and sold at $13,000 in September felt clever until December hit $19,000. Another bought at $19,000 in December and held through 2018's 80% crash to $3,600, then watched it climb to $69,000 by 2021. Same asset, same decade, opposite outcomes determined by patience, not prediction. Time in market has historically beaten timing it by orders of magnitude across every major cycle.