Blockland = building game
You're supposed to build the city yourself.
There just doesn't seem to be a lot of purpose in maps like these. If you genuinely host these you're probably lazy.
The map is made for people who experience Brick Lag, the lazy ones, and the one who HATES their building skills. It was also created so that people can easily create Team Death-matches without wasting time on the city itself. If you want a building map, try downloading some slate maps. ;)
Blockland is not be the game where people are forced to build (If that the case, I would be playing GMod).