Upload & Sell: On
Personally, I keep it simple.
With a series or slight variations on an image, I initially use survey mode to cull out those with unfixable technical flaws and reject and delete. If there is a winner, I rate it high. With the others, I try to rate them, but I still am often left with a number of images I am not sure what to do with.
I leave them be.
Then I return, weeks, months later. And cull them again. Usually I am now less attached to the images and can reject and delete more and promote a small number.
Generally I move to saving less images over time. After all, if its merely a variation on other images and I still see nothing to make it stand out, why keep it? I do have a number of single images or very small sets I hold onto, sometimes reprocessing them years later with more than positive outcomes. But if its 20 shots of the same thing and none stand out, why keep them. And, like most of us, I suspect, we hate letting things go.
So, initial survey, rate/reject. Come back later, less attached, survey, rate, reject. Maybe reprocess a few. One more round, rate/reject. I might now have gone from 20 images to three or four. I am OK with that.