Some peoples' minds are easily boggled.
Here's the thing.
For YOU, or ME, or Pa Kettle, 6000 rounds is not a big deal.
This guy was a GEEK. Played COMPUTER GAMES. All of a sudden he buys 4 weapons, 6000 rounds of various ammo, and enough chemicals to make a variety of BOMBS.
Although it was LEGAL for him to purchase, does it not seem a bit odd, in light of his normal life/practices ?
I actually think he wanted excessive amounts of ammo, because that was the content of pictures impressed into his brain by watching Batman movies, reading Batman comic books, and fantasizing about being the anti-hero.
And I think I know who he zeroed in on to imitate.
This is James Holmes just prior to the murders.