I think this really depends if you want to come up with it's expected value, or you care about e.g. the p50 or p25 or worse scenarios. Worst case is probably too negative most of the time, but occasionally you might choose to join a company that then implodes or has some really nasty problem surface that tanks the stock value. It really just depends on how risk-averse you want to be as to what metric personally makes the most sense.