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But removing a player (you can always come up with a reason) can be a disadvantage for another player who could have used it to tie the score with one of the contenders for the next round... I think this doesn't need further explanation.
But withdrawing from a tournament due to a lack of motivation, especially when you play the game every day, is a direct disrespect to your opponents. No one thinks that some people sign up for a tournament to play with strong players? And here they say, "No - I don't want to play with you." If this is allowed as the norm, then some will withdraw after the first game, and some even after the draw.