DX 1:The bottom two are made by the same people
2:It's in Japan, and school series are very popular because kids can relate to them, also, in AMerica, we do just as many school movies, cartoon series, and pretty much all of our uniforms are the same style.
At the same time tho, there are many people who like anime past high school, and they live perfectly decent lives! In the mean time, we're getting WAY off subject as far as what this board was posted for. And 1 more thing, the people who made those series got A LOT of money!!! And those are some good anime series's also, if they were live action and American styled, they would probably be just as popular here in Amerca :)
And also, like I said, look beyond what one person got, if you look at OTHER anime series's, the less popular ones, you'll notice that they vary quite a bit. And in Death Note, they don't have gay little smiles, not smiles at all... and most of the charecters are BOYS
And anime isn't going to suddenly disappear, you're going to just have to deal with it.