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Some additional cosiderations on using the sandbox:

First, a migration mechanism might encourage good behaviour, for example by migration being only possible if the post has a minimal score, and/or after the post has been long enough in the sandbox to allow other users a chance to see it (of course the user could still manually copy the post, but easy migration is an incentive to follow the guidelines). On the other hand, it also could allow to encourage use of the sandbox, for example by giving a bonus on the score and/or the reputation (for example, migrated posts might start with one upvote).