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Why in the world would anyone pay more than the HT for an item. It's permanently in stock and the prices never change unless TNT has recently added the item and they find that it's either more or less popular than they were thinking it would be and lower/raise the price to match demand.

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To catch out the people that don't know any better? If someone's, say, been away from the site for a long time, they may not know that certain items are stocked in the Hidden Tower. They may not even remember the Hidden Tower exists. So they go to the trading post and buy whatever it is they want there, unawares that it can be bought cheaper elsewhere. I know, it's unlikely, but you never know