I've flagged a number of questions for migration to various other Stack Exchange sites. All of these questions are closed. All of these flags were marked as helpful, but only half of them actually were migrated (5 migrated, 6 not migrated).
I would've assumed a flag for migration is helpful if it results in migration, otherwise it's just a waste of a moderator's time. How am I to understand these "helpful" flags without any consequences? Should I continue flagging such questions? And why weren't the questions migrated? (I can provide examples if that would help.)