Having a poll each month might be somewhat excessive and there isn't an unlimited supply of maps to replace removed ones with either. However, we can certainly discuss which maps aren't necessary on the servers as they're just unpopular, broken or easily exploitable (e.g. dr_minecraft_redux) and other maps that the playerbase would like to see.
Besides, I'm certain I'm not the only one here who wants to see Jailfort again right?... right?