1) What should the majority be in such a vote, and how much time do we have for it? 2) Why is a game with random heroes even needed if, for many, the heroes themselves are also favorites, just like the castles? It's not just that you want this – why? Do you simply like randomness, or what?
2. Since there is no bidding for castles, this is a way to slightly balance the start for different castles.
And frankly, games like "Shafter-Tant," "Luna-Kir," and "Crag-Tazar" are getting a bit tiresome.