I know someone would ask, "then who loses, there's always a loser". My answer, "the Nocoiners".
This indirectly states that those who sells are the loser
.I think it is on the point of view of a person, in trading both person can win, for example I am selling Bitcoin higher than the market value, and this person wanted to buy Bitcoin so Badly but he cannot buy in an exchange. In this case, I win when I sold my BTC to that guy since I got profit, and the guy win since he is able to buy Bitcoin that he had wanted for so long.
But in an actual trading market, those who did not do their assignment often become the loser and taken advantage but those who dedicate their resources in researching and updating themselves (the winner).