Because its easy.
Players started to play teeworlds.
Players get well.
Players played ctf2 a lot cuz you can play highlevel matches on it.
Other (beginning players) play ctf5 cuz its fun, map becomes most popular map.
Ctf4 were out.
Highlevel community dislike it, they dont play on it.
Ctf7 were released, able to play highlevelmatches on it, highlevelcommunity will take it to maplist.
New ctf4/6 sux, wont be played.
You see smth?
We dont have to do anything, its up to the mappers if they think a map is good enough to release it to get played from players then they release it, and the players decide if they want to play it or not.
Maps like ctf5 are nice j4f, but not for real highlevel games, and as you can see, there are a lot of servers with ctf5, because (sorry) noobs are playing it.
BUT! you want us now to play the maps which sux for highlevelgames and tell you what to change that we are able to play on it, what for?
You should think about, if even the nubs arent playing on the map, the map simply sux.
Ctf5 is the most popular map without being played by highlevels.
Would you change the topic now? :>
I mean its not our fault, if even the nubs dislike the map, just replace the maps with some new tries, till they are funny to play or able for highlevelmatches.