It's horrifically short-sighted and poorly tested to throw Gold, Wood and Elixir in as equal parts for research; Dwarves don't use Elixir at all, so it's a completely wasted resource for them, aside from research. If you don't like Priests, it's just as useless to Humans. I'm massively tempted to go Lich, just so I can use the 70k of Elixir I have piling up on my Castle14 server, because I can't spend it on anything!
The cost of troops needs to be looked into, why not make it Gold AND Elixir? There needs to be balance if this (pretty awesome) game is to continue.