I submitted my JMP to a good journal. Ref reject, not great comments. Made a few changes and submit to a lower-tier journal. R&R. Reviewers give me a couple of comments that I pursue, and pursue a little farther than perhaps the reviewers would have had in mind. Now I've got some *really* cool results. Maybe good enough to have a shot at a better journal.
But it'd be dickish to do that. And plus I'd get caught.
Anyway, thought I'd share.