Quote from denner:
There's nothing uncommon about what your friend is doing. I've known more novice, beginning traders that put up tremendous runs WHILE the market trended upwards (or as the case may be they held out thru brief downturns). The problem is they will never stop until that 20k gain turns into 50k-100k in losses. It always ends the same way for the novice traders. Most just walk away, others might try to get back the "magic", but they usually don't since the psychological damage is too great.
It's why alot of firms will also hire people with no experience in the markets. They want that "empty tablet" so to speak and certainly don't want anybody with a bunch of mental baggage after going boom and bust a few times.