It's still stupid. Even if he bought in at 40, which I highly doubt, selling only 80% at 48 would have covered the investment, and the rest would be available for further long-term growth. Trying to predict peaks and then selling all is not a viable speculation strategy, and only means he's trading based on emotions. Which is stupid.
Such people are caught later, when bitcoins grows to I don't know, 100, and he re-enters with all profits, then bitcoins crash to 20 and he sells in despair, left with heavy losses. I've seen it happen Hope this particular OP would be smarter and would waste all profits on booze.
I sold 45% of my stake at 45.50 last night and recouped 120% of my initial investment. Left the remaining 55% on the exchange to ride it out. My goal at the moment is short term trading to get my USD funds up enough to buy one of these:
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=331429112
Or if BTC goes to the moon:
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=331757394
Am I doing it right?
When you buy, try using bitcoinLook at these:
http://www.gunbroker.com/All/BI.aspx?Keywords=bitcoin&SearchType=1