Also, people should watch the Difficulty, not B.SELL - if you know where the Difficulty is going, then you know where SELL is going as well.
Who knows where difficulty is going? And why worry about it anyhow? We are trading your fantasy stocks after all. There are advantages in your game not applicable to playing the bitcoin market or the miner market.
One has to pay attention to B.SELL as this is part of your game and we are playing it.
8% return, last 30-days on B.EXCH.
Simple math.
Are you denying this, 20s? Math Time 
I'm using 6/21 - 7/21.
B.EXCH Starting Price 6/21: 0.03847462
MINE Dividends Paid 6/21 - 7/21: 0.00522894
SELL Dividends Paid 6/21 - 7/21: 0.00854093
Current Buyback Value: 0.02625510
Total Divs Paid + Buyback Value - Starting Price = 0.00155035
0.00155035 / 0.03847462 = 0.040295436 = 4.0295436%
So, yes, I take issue with your math.
You keep saying 'hold short term, not long term' and I'm not sure if you're being sarcastic / facetious or not. Because, as evidenced by the earlier math, both have been profitable (inception to now, or 30 days to now).
Who knows where difficulty is going? And why worry about it anyhow?
That's the whole point here. 'Worrying' about the Difficulty is the basis of the whole Derivative here - no one knows exactly where it is going, of course, but
certain tools are awfully helpful at giving clues in the short term.
EDIT: I see that you deleted part of your post - don't worry, I quoted it
