This is one of those subjects that cycles through over and over, the last iteration was only a month or so ago and got a lot of attention... beats the Nikon vs. Canon debate any day I suppose.
I think there are a lot of people who shoot models strictly for fun and development of their hobby, which is serious amateur photography. You can't fault them for shooting 1000 shots in a few hours because it's the shooting and the post work that they enjoy. I'll confess that when I shoot my girlfreind (who is my only glamour subject), we usually have only a notion of what we want to create. We may shoot 400 images in a long session, I keep most of them but only show a few.
I am a commercial shooter though and when I shoot products, I know exactly what I'm after. The digital camera allows me to test and tweak extensively without peeling polaroids. Friday night I shot 74 images of a single ring including tests; it took 2-1/2 hours. Of those images, 12 will go to the customer for selection and he will choose one. A year ago I shot a belt buckle for the same customer on 4x5; I shot 4 polaroids and three sheets of EPP; it took 3 hours. We printed one.
So I guess what I'm saying is, it depends on your motivation. If you're shooting for pleasure, the number of images isn't really relevant as long as you enjoy what you're doing. If you shoot for a customer, you have to know what they want. The number of shots and time you expend is a matter of efficiency... and probably a good indicator of your knowledge and experience.
As for directing, it's a skill of its own. You have to be sensitive to people and know when and how to tell them what to do to get the results you have in mind. Very few people can do that in the first few tries... you have to learn what NOT to do as well as what you should do.
And about lucky or good, that's a great observation. I'll admit that I can't necessarily reproduce every shot I take but most of them I can... I guess I'm just good and lucky. Take that a little bit further though. Can you reproduce every shot you create in your mind? To me, that's mastery. I can't at this point... but that's what I strive for.
Ps. The single light stuff you posted is really cool, the background separation is remarkable considering it's lit with the same source as the subject. I gotta try that soon.