I deal with my own share of superhero, scientist and soldier types so it really wouldn't surprise me. But challenge or not something tangible is usually preferred in the long run.
Not so sure about that but then again I know more about the Seal than you do at this point. Benefit of being around longer. It was one of I think 66 of them created to keep Lucifer in his cage. Some demons wanted him out of the cage and they broke the Seals. Along the way that Seal was broken and a bunch of other things. No one really knows why the one that does the whole kidnapping thing does what it does. Or how to control it. And we've got pretty powerful beings here who should be able to. Like Rumpelstiltskin.
The Winchesters know more about all of that though if you ever want information.