The main problem I see is that with all of the maps coming out, unique or not, many of them are going to have great areas (design-wise) and only one is going to win. Then, it's not like other mapping contests where the person who wins wins and people get to play whichever map they want. Now, we have one map which some will like, others probably not and a whole bunch of dead maps that all look amazing.
I've seen some that are based off jungles, deserts, bases, mines and so on, a lot of unique ones that I have never seen before in any way shape or form, but if they lose it's a lot of design effort lost and probably never seen again. Unless they create prefabs out of them and incorporate it into new maps, or just go throught the process of creating a new map.
But on the sharing what my map looks like part, I have sufficient (in my mind) work done to show a WIP, but I have too much mindless crap all over my map, just for reference or to place them later that screens would look to messy.