If El Salvador sells their Bitcoins, they will gain that huge profit but I don't think that was in the mind of the President. Therefore, they don't earn that yet.

Well, we could use that example that holding Bitcoin really makes sense but I don't encourage holding forever as we're not making any profit from it. 
Buy, Hold, and SELL -- this is how it works. But El Salvador has another reason for the accumulation of Bitcoin and that is for their future currency, not like the intent of casual investors.

This is an eye-opening for doubtful people, impatience people gain less while holders get more. Of course, we can choose where we become comfortable but it was advised to trust our investment.