First of all, I think that those of us who are amateurs (I consider myself a "serious amateur") naturally have different habits, processes, and expectations than the numerous professionals here on Wetpixel. Having said that, I happen to have put together (for a presentation to a photography club) some stats from my last (very short - only 4 days of diving) trip:
Total underwater photos shot: 934
RAW files kept: 532 (57%)
Edited in Photoshop: 87 (9%)
Put in slideshow or web gallery: 41 (4.4%)
"Excellent" shots: 3 (0.3%)
As you can see, I tend to keep about half the RAW files (the rest get dumped before importing from the card), but I only do anything with (process) about 1 in 6 of those, and only actually end up showing anyone about 1 in 20 of the originals - those are really the only ones I consider "worth" keeping. (The reason I keep so many more of the RAW files is mostly in case I'm later looking for a shot of a particular critter, etc.) And only a few from that trip were what I considered "really" good (excellent).
Interestingly, my "hit rate" of decent shots has remained consistent at around 5% for me ever since my film days over a decade ago. I sometimes wish I didn't have to shoot 19 bad shots to get one good one (or hundreds to get one "really" good one), but I've resigned myself to that being the case.
Edited by bmyates, 20 May 2010 - 08:36 AM.