In bitcoin accumulation, any attempt to sell and buy back implies Trading/Gambling. No real bitcoin investor would love to test trading at the first place. Selling off your bitcoin to buy back is crazy because you may end up either not buying back because the price is not dropping to your taste or you buy lower coins which also leaves you at loss. Bitcoin investment is a long term journey and should be held jealously for long.
It's okay if someone does some trading test as long as he'll do everything to get back the sold Bitcoins. But it's hard to do that when psychologically, you just don't want to do it anymore because the thinking is that you still have some left.
But we're free to gamble/trade if that's the term there.
Because we have different goals and focuses while we're all holding but the main goal, is to hold for long term goal and see the historical peaks for Bitcoin.