You throw this stuff out like most people pay bills - all the time, and you have to.
I think it's gone past song structure and sound and performance - you're always right up there in those areas. Plus, you're really innovative musically. I think it's a matter of how you deal with all this stuff. How do you pick and choose? How do you decide what goes on the album and what gets culled?
There's this thing that happens with my songs. I write an album. I think it's great. I start to record it, and more often than not, another album occurs to me and gets written. The two albums get worked on at the same time. And then, of course, the third album crops up. I feel buggered. How am I gonna get all this material recorded and out there? Anyway, all of this takes time, right? So I go back to the first album and find out that, actually, not every song's a keeper. After another month or so, I find the same thing's true of the second album. To make a long story short, three albums yield one good album of material in the end. It's like wine. You make it, and bung it onto a shelf in the basement somewhere, and then go down after a while and sample it and find out if it's any good.
Of course, you probably know all this. Anyway, if you do know all this... buy me a bottle of wine?