Using the Binomial Distribution to obtain the probability function in the specific case of receiving 0 rewards yields the following equation:
Probability of receiving 0 Qtum rewards over N trials = (1-Prob of Staking)^number of trials
Prob of Staking = My Qtum Tokens / Network Weight
Say Network Weight has been fluctuating between 5,621,326 and 22,485,302.
The number of trials per day is 675.
In my case I have been staking for 14 days. So I have gone through 675*14 = 9450 trials.
I calculated the odds of me receiving 0 rewards under the above Network Weights for the last 14 days to be very very low.
I guess this could mean I am just extremely unlucky. It could also mean something else is going on in the staking reward math, that goes beyond just basic probability based on your Qtum / Network Weight.
Assuming Network Weight doesn't fluctuate any more than the above two values, I should be due for a reward very soon. Otherwise I will soon be experiencing a <.1% event. I'll give it another few weeks, hoping the Network Weight doesn't shift that much to make things easier. If I don't get a reward still, then I would conclude something has to be up, as I would have gone through way too many trials to not realistically receive a reward.