So far I have yet to intetionally make much use of my hard earned and saved gold because it has been accidentally wasted as the result of a mis-click. I just wasted 50 gold by accidentally clicking on a mist dragon in the market. Before that I wasted something like 25-30g on a mis-click to speed up a land expansion.
So I've wasted about 80 gold pieces and have nothing to show for it. Would be nice to have some kind of confirmation before spending gold... Bah