same here. when going on vacation compared to weekend outing, we usually bring quite a few photos from various sources (recent trip to Borneo - my dslr, gopro for diving, fiancee's point-and-shoot used also heavily in underwater housing for diving, her cell phone which she carries everywhere compared to camera). All combined it was cca 2000 pieces, damn too much but when you are there seeing all the diffrent beauty all the time, it's hard to resist snapping more than bare minimum.

the issue among others is, the most amazing places are sometimes off the grid, some photos require some proper processing (panoramas, night shots with milky way etc). which tends to take a lot of time and you need proper PC for it (lightroom, autopano, photoshop etc).

it would be a poor use of precious vacation time to spend evenings editing photos, wouldn't it...

on the other hand, however amazing it was (and it was, highly recommending before those idiots burn rest of rainforest and transform it into palm tree plantations) - I am not going to look in next months into photos once processed, however amazing they are (and some, especially diving and jungle ones are really :-O to me). we do various mountain stuff a lot and most weekends tend to bring additional set of pics. so it has to be process-quickly-and-move-on, otherwise it takes all my free time.

So the answer to "Why?" is "because I say so".