Maybe because "its working for them so far" people seem to be buying, they seem to be working flat out to fulfill orders... 

BTW I'm not advocating the model. But as someone else said, in August there will probably be other players selling from stock esp China. This would make sense looking at how fast they have caught up and the way the marketplace has changed to a year ago. I've also done my last preorder. Bitmain has changed the landscape forever and thats the model we want to promote.

I understand why not stocking is good from a business sense, the risk is all on the buyers not on the company, build to order is a good business model for the business, no stock means nothing sitting on the shelf eating away profits. It means nothing that has to be sold in "fire sale" ie at a loss, to clear old inventory.