The problem with getting in and out of crypto-currencies is that the door way is really small. So HODL has an advantage there too.

Since we know we are at the beginning of block-chain adoption.
And we believe that it will be the future.
Then the trend is very bullish.
So, sitting and holding is just a good safe bet.

At any time in the near future, a number of shocks to the ancient financial system could happen sending billions to try to get through the tiny door into cryptos. At that time, HODL will be the only winners.