makers are a pretty useful asset for your assualt, it makes advancing SO much easier, and I hate maps with no ore.
The easy option is not always the best, neither is it always the most fun.
Plus, if there was something that could make ore, do you really think it would be easy to get at the start of the map, or that it would produce ore fast enough to be of any use at the start of a map?
There are rumoured to be some new items in the next update to the game, so there may be one in that, but I am not sure it would really add to the game.