1 steel:
6 iron ore = 30g
4 wood = 200g
10min = 200g ("20 gold per minute")
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hmmmm.. looks like 500g for me

Yeah, i know that ppl sellin it for 900g, but almost 1k for 10min works and with common materials.. it's too expensive. Thats why i buy mostly buy for 600-700 not more.

If u want to minig than manufakturing so go on, but in minig noone pay 20g for minute :)

If u want 900g for steel, that's mean u want 60g for min.