I believe the term you should be using is "gold sink" it is not designed for boosters specifically, it is designed to be what it is, a gold sink, an exclusive auction house with items not common to see on the market. Unless all gold sinks now in your book is designed for boosters?
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Looks more like a bidding way that had gotten out of hand. Gold sinks for you.
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Mate, some people still farm it since day one, and no drops. If I could buy Invincible for 2 million gold, I would do so right away with how crap my luck is.