2). And I fail to understand your blindness to it. Yes, there's always the possibility of injury; but if there is such a thing as limits. And pushing oneself too hard. I don't think that the 3A value should be increased because it already is quite substantial; it's already, as Mathman stated, 2.2 points higher than the triple lutz. Furthermore, like I stated BEFORE, these are competitors who want to win. And for a competitor, that desire to win can easily translate into over-extention. You're placing too much faith in human reason and logic; people oftentimes don't know their own limits. And even if they do, considering how our media goes on about how "limits are made to be pushed/broken," and their competitve streak, I have a feeling that they would continue practicing, in which they run the risk of incurring a serious injury that could possibly end their skating careers. I mean, Yu-na for example; back in 2006, she was overtraining herself, doing jump after jump even if she fell multiple times. Was she pushing the limit? Yes. Was it healthy? Helluva no.
Plus, you fail to address the fact that harder does not always necessarily equate better. Look at the Men's Long at the Olympics; so many splats from men who were doing things they couldn't handle, such as quads. Plus, we do not need people to start taking on the attitude that 3A= winner.