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The Sandbox is intended to be a place for feedback, right? If I lost rep because my sandboxed idea wasn't good, I'd be pretty angry about that.

Don't have the Sandbox modify reputation; instead use upvotes/downvotes as votes of approval, and set a bar for which the question can then be posted on the main site.

I don't know if it's possible to migrate a question to the main site which would negate the problem entirely?