While anecdotes may support an argument, small sample sizes are not really mathematically useful. I'd like to try to focus this thread back to that sort of discussion. A sample size of < 50 drops is really not going to be revealing since statistically speaking, it is perfectly reasonable to have wide variation in such a small sample. However, if we see some trend still showing up in 500 drops, then this would be entering the realm of statistical anomaly (or the droprates indeed are not as we expect).

There seems to be an assumption that droprates are uniform but this is exactly my question. Does anyone have evidence (not small anecdotes) to support this?