Your observation seems quite correct, Hueristic. My words remain materially inadequate and insufficient in the eyes of Dabs. 
It's not like that at all my friend, your words are all good. I just know you can do a little bit more. Perhaps you already do and no one knows about it.
As for the DCA, I've also read it somewhere else that one of the better alternative strategies is to buy in lump sump what you can, maybe in the case of bitcoin after testing out a small amount, particularly if it is a new exchange or method you are using.
For both buy in and cash out. Cash out method is entirely dependent on any target acquisitions you have in mind, but the DCA suggestion is geared more towards a similarity to a so called "safe withdrawal rate" where the principal value is largely unaffected.
With bitcoin specifically, increase in value is mostly capital appreciation.
The only reason DCA would make sense is if you've already gotten your initial allocation of corns, and rely on outside sources to continue buying in, and most people don't have large amounts of funds set aside for that. So they get from what they can, which is usually a wage or periodic profits or monthly or quarterly dividends from other investments or sources of income.
The average working person would get it from their paycheck, which is either every month or every two weeks. They set aside some amount on that day and just buy whatever corns it will let them.
The key point which I believe you are trying to make is to remain as unemotional about the process as possible, so DCA affords some of that ability. No thinking. No waiting. No timing. Just buying.
As for selling, that again depends on your particular situation. If you don't need it all today, can wait a little bit; however it is always a good idea to keep a minimum amount of fiat around so one does not get aggravated by sudden or unexpected expenses, almost all of which can only be paid in fiat or legal tender.
