In a way, that's how the video rental business works. I pay a flat fee to Netflix, and they supply me with a bunch of DVDs every month. They have to buy enough DVDs to supply everyone, so if lots of people watch their anime through Netflix, Netflix must buy a lot of DVDs.
It's less convenient than teh Internet, but it's vaguely legal, and I like that.
But I also buy series that I like (Lain, Infinite Ryvius, FLCL), and series that looked good back when I was too ignorant to download stuff (Inuyasha season 1 box set, Gundam SEED, Witch Hunter Robin).