By selling miners they leverage their assets. The money from selling the miners can be used to build even more miners than they could otherwise. It also hedges their bets by having multiple revenue streams from different sources. I think they know exactly what they are doing.
Of that, I have no doubt. Just don't see them 'going full evil thou' ..as in the previous post..don't get it ...just sell hashnet...keep it all?

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We are on the same page, I just misunderstood a previous comment. I agree they don't have any reason to go full evil they are doing very well as it is.