If you do GE, you will find rogues very helpful. So like jaelis suggested, try to get them in the easter event especially if you are interested in the GE aspect of the game. Perhaps they are beneficial on your continent map in the eaerly ages. I don't really remember. However, in higher ages, I don't tend to use them at all. But, because of GE, I have plenty of rogues. I believe they are also helpful if you attack your hood, but don't know for sure, as I dont' attack my hood at this poitn.