exactly, so what, even long term is 投机, just matter

of how many 投机. You can say today this company FA is very good. but when you buy it and hold it, it's 投机. Just look at BP, a couple of months back it's one of
the best company. Now people here are talking about the it's out of business. The decision of buying BP will have
some kind of the 投机.

Same thing for AAPL, MSFT, GOOG, and whatever good companies today. Can you say AAPL will continue shine like last 18 months ? Will other mobile devices give big margin pressure to AAPL ? You never know for sure.

DT has more 投机 than any other trading, it's usually based on the TA to do the trading. If you know the company FA, many DT trades actually combine DT with ST. It's hard to day which one
is absolutely better because the action of hold an stock overnight itself is 投机.