I have the tendency to shoot too many photos, although not necessarily all of the same subject in the same position; I try to change perspective and angles, see what happens when I do x instead of y, etc.....but I still wind up with too many shots on the card when I get home. I also have the bad habit of culling through on the first go-around, choosing images to process and taking them into Aperture (or now also Luminar).....but then only editing a few, leaving the rest just sitting there. Sometimes when I review them prior to processing at the point I choose not to edit one or another because something isn't right and it's not worth trying to fix, and at other times I just don't get around to even checking that in the first place.
When using a new camera I often have few keepers, as I'm just experimenting as I get to know the camera and what it will/won't do and what settings I need to adjust for best results. I have a little tradition of when I unbox a new camera, once it's set up with the battery charged and a memory card in it, the first couple of shots I do are the box. Sometimes I'll use another camera to also take photos of the new camera perched on top of its box. I don't usually keep any of those first few shots, but it's just a fun little thing to do....
A lot depends upon the situation I'm shooting, the lighting conditions and so on, too, as to how many keepers I have and how much gets deleted after scrutiny in the computer. I never delete anything while the memory card is still in the camera, even when it's an obvious goofy shot such as a misfire if a finger touched the shutter button by mistake.
Shooting macros definitely results in a high percentage of throwaways, especially if I'm trying to capture an insect or butterfly.....squatting in a flower bed, camera lens close to the subject, trying to reach in closer and closer....well, sometimes this process just isn't successful. Manual focus is definitely more challenging for me the older I am getting, and that does not help matters!
One thing I've never quite gotten comfortable doing is using the histogram and examining it while chimping and checking an image after I've shot it..... While I understand the concept of ETTR (exposing to the right) I have never quite made a habit of consciously ensuring that I do this while shooting. Probably if I did pay more attention to this I'd have better results at times!
