Actually I do find it rather interesting. I'd imagine that, for safety's sake, they don't want to drop them from any higher than 250 meters. That's pretty low, really, considering the ejecta from the impact reached so far.
The only news here is that it was a girl that thought it up....not some guy who was bored...because every guy has had the random urge to drop things from great heights at some point in his life.
When I was taking a field geology course near Canon City, Colorado in college, I was part of a group of students sitting below a rather sheer rock cliff. Suddenly, a large boulder came crashing down about 30 yards from us. Looking up, we saw one of our fellow students pushing another rock toward the edge. When we asked what in the hell he was doing, he replied: "Just helping Mother Nature take these rocks toward the ocean".