I’ve got about 50,000 images catalogued in Aperture 3.0. I’ve probably got an equal number from before I started using Aperture. I try to be ruthless about trashing images I don’t expect to use, but laziness often prevails. Good thing, too, because every now and then I find an image and wonder why I didn’t notice it before.
I go through my older images every couple of months to delete unused files from assignments, since I sure don’t need them if the client didn’t need them. I’m undoubtedly keeping more than I should, but I’m also learning how to shoot less by studying my second-tier images. And it’s fun to go digging through the archives and discover overlooked beauty.