The current drop system was or seems to be designed exclusively for bots. If you slaughter 40 or 50 of a mob you will start to see stacks of hide drop. If you slog through 200 you will actually see a yield of around 240 for your trouble but you see nothing in the first 40 or 50 kills. So if you want to farm hide, you better be ready to make it a long haul venture.