1 - The Worldstone was actually used to keep Sanctuary hidden, as I believe it already existed; it wasn't created for that purpose. It was destroyed in D2 because it had been corrupted by Baal, which, I believe, would give him influence over the entire human population. Tyrael couldn't change it back, so he thought it best to destroy it. Why was sanctuary known to some demons (and angels) despite the presence of the Worldstone? I'm not sure. Maybe someone can answer this.
I don't know if that was answered but in the Book of Cain it is said that in the Mage Clan Wars, one of them, the Vizjerei, started to mess around resurrection, demonic magic, bringing some forms into our world. And Thought they could use it to crush other clans. That made the hellspawn aware of the sanctuary, and even the Prime Evil helping and corrupting the brothers that lead the clan.
Maybe it's your prices that are off. I'm selling a lot of stuff there. AH and RMAH, especially selling old items in the RM and getting them cheaper after you exchange for gold.
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I don't know if that was answered but in the Book of Cain it is said that in the Mage Clan Wars, one of them, the Vizjerei, started to mess around resurrection, demonic magic, bringing some forms into our world. And Thought they could use it to crush other clans. That made the hellspawn aware of the sanctuary, and even the Prime Evil helping and corrupting the brothers that lead the clan.
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