I'm not so sure it's just RNG. RNG would account for drops occurring once every 5-10 ventures or so. It would not account for this sort of drop rate, which was consistent for MONTHS, to suddenly drop to ZERO and stay that way going on for a month now. It would be interesting to compile drop rates for various characters across different servers and see if there is a trend. I wonder if it is possible for drop rates to be tuned according to supply for a given server.