What about people that like 3 out of 4 maps, and dislike the 4th one that we decide to make the permanent map.
As I said, if we do a duel server (#1) with the first map, then an other duel server (#2) with the second map, people that doesn't like one of the map will just have to go to the other duel server. Simple as that, and without rtv.
We aren't in the case of 4 maps, but 2 maps.
Assuming there'd be rtv, players can change the map at will with the votes, it gives a more rounded server, compared to the permanent dm_duel.
Imagines now we're on the map #1, then a man that doesn't like this map come. He will say "rtv", but nobody follow him, because the other players like this map better than the other one. Then he leave because he hate the map #1.
Later, an other man, who prefer #2, will type rtv, as the other one. Nobody is following him. He will leave because he hate #1, etc.
Sometimes in duel (not always though), there is people who're asking me if there is a second map, I answer them no.
After this :
1) They leave/they go to an other panda server, because they don't like the map #1.
2) They complain, then I usually say "well, go complain/suggest about it on the forum", nobody do.
I didn't told rtv was a bad idea, I meant that it can make people leave, but if we make a second duel server with a different map, it will surely bring more people.
That's what I think.