My friend came up with a theory that certain items drop at certain times of day. For Example: A Stormsheild will drop more at say 12PM than 12AM. Otherwise I don't know, maybe blizzard hates you.
LOL! I used to think that. After getting (from meph) six gazes, five arachs, 12 ik mauls, etc. all in a 7 day span of mfing for 50 runs a night at about each time.
This past week has been strange. Haven't found much lately. Not even one ik maul. I was about to give up last night on my 37th run when an amulet dropped. Yea, thought Civerbs again. Whee. Turns out it's a tal's ammy.
But you know what, for the most part, I think your friend might be right.