Why is the sell wall on BitBTC currently so high?

[biophil]

BITBTC has always been pretty illiquid. I've noticed there haven't been many shorts on the book for the past couple days. But notice that despite the illiquidity, the peg has held fairly accurately.

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[starspirit]

At time of writing, feed price around 11900, lowest ask at 13765, around 16% premium. Anybody suggest why this might be?