The query itself is quite safe. I've run it at least twice now, it's not caused any issues that I've run into.
Is it safe to allow 1000s of attachments to be uploaded? Of course not, because you'll always find the clown who'll fill up your server with massive attachments.
Everything in moderation. I just ran across a legit need for more than the default dropdown 10 (legal fansite downloads of shows), and thought I'd share how I did it for someone else who might need to do the same thing.
Of course, you'll have to moderate stuff heavily with a lot of attachments, but that's a given
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