Sometimes, I just shoot the one photo, get it right the first (or the second, or the third/fourth, if I have to adjust focus or exposure) time, and am happy with it. Sometimes perfectionism gets me and I get stuck on one angle, one shot; I found the perfect angle and composition, I got a good shoot the first time, but I'm not happy; I play around with the flash, add lighting, do 10-20 different lighting setups til I get the one photo I really find perfect, and then dump the rest of the 30-50 shots of the exact same subject from the exact same angle. This is only true for studio photography though, when outside in the real world, I take a lot less shots even if I don't get it right the first time.
I'm not that old, but I come from film cameras and polaroid, though only as a hobby. I truly began learneing photography on digital cameras, but I don't tend to waste photos. If I only shoot for myself I take maybe 1-50 pictures a day on most days. I'd say 70-90% (and rarely 100%) are keepers on a good day, 20-70% on a bad day. If I get stuck like I explained above, then it's a lot less, 10-20%, but I don't think of those photos as wasted, I think of them as something that helps me learn: I review every single one carefully before deleting them, to learn more about my mistakes as well as how the light interacts with the surface. Light (and its compliment, shadow) are such complicated things you can never stop learning about them.
1000 pictures a day is insane. At that rate you'll go through a shutter in 3-6 months. How can you take that many pictures a day, unless it's specifically for a client?