This is an interesting tool and could be very useful for those trying to look at different investing strategies. I am not sure if this will be possible, but I could see the earnings from nodes being calculated and plotted using a set number of simulations and then plot a band of simulated outcomes with your single black line following in the middle.
For instance, you could simulate 100 trials over the timeframe selected, where every 4hrs you give a node a chance for selection based upon total number of nodes on network at that moment in time (or allow user to enter this value and default it to incognitos current goal, which I think is 1800). Then once in committee, you have 3 chances to be selected to earn based upon total number of nodes in committee. Save earnings of each 4hr block into array/vector/etc…
Then you can plot the high low/high/average/etc of all simulated runs and give people a much more accurate expectation of what their earnings could look like, and would probably make the tool more accurate overall… This may be way out of scope, but seems like a nice addition with all of the randomness involved in earnings on node side