Well I just became one of the fools that accidentally sells a large block of MH on Zenportal for $10. I was selling some Zens at $10.24 ($10.75 after GAW adds its 5% to sale price and $9.73 to me after it takes its 5% cut from the seller) the miners move every time one is renamed or sold and it seems that they moved as I clicked and I didn't notice so I sold a batch of Hashlets I paid over $1500 for at a total price of $9.73.
The hashlets were literally gone before my finger came up from the click which makes me wonder if the suggestions on hashtalk (long since deleted) that GAW automatically buys all these mistake sales are true.
That sucks. I do believe they auto buy at a certain price threshold as well.
I've heard this before... why would they buy their own virtual miners from you? They can keep spitting out as many virtual miners as they wish at full price.