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I don't know why these numbers are so random. At least your 34% roll gave you a direct profit...

You're expected to roll 25% on average i believe so on average you will profit.

The main things that influence it is changes in STEEM/SBD prize on the market and currently voting power of the randomwhale account (voting power can be seen on http://www.steemd.com/@randowhale in the 17th row of the table on the left).

Yeah, with the $1.50 SBD price, I lost on all 3. Even the 34% roll didn't get me $4...it got me somewhere around $2....the other $2 came from future upvotes from other steemians.

I don't know, it might be because of the exponential rewards that are still in place. Tomorrow it will be linear so people with millions of dollars don't have 1000s of times more influence than they should.