I don't think it's reasonable to set a standard of never spending gold. Spending gold is not the same as spending money. I don't spend real world money, and I wouldn't get in the habit of using gold just to speed up the game, but I save up my slow accumulation of gold and spend it strategically on things that advance the game and give me a better chance of winning events over the long term. Additional nests and the second evolution temple are at the top of the list.