And I can't tell what you are trying to say but my strategy of holding for the longest time has worked fairly well so far. I entered the market in the winter of 2012.
I think what he is saying is that while currently there is momentum in BTC, that could change. Governments step in, another digital currency takes market etc... Without a plan, any investment is worth basically nothing because every stock/currency etc does not last forever.
I guess it comes down to your personal TA or gut when to sell your investment... There are people out there that sold at 37 on the way to 266, and those that sold at 50 when they bought in at 266... Some will buy in at $1 and still think that at $1000 they should still hold because it could become $2k eventually etc etc etc...