5 Purples and several superb runes? I call that pretty lucky. So what if you had the Griffon before, that's actually a really good drop that you're basically just feeling jinxed for getting again. I know people that'd kill for that bow.
I got a great 2Hander recently, and that was mostly luck-- but I like to think it was my Katari charge on the boss finishing them.
That's hardly good luck, 2 of those purples were not even over level 10. One was level 18, and the other both duplicates, from over 55 large chest.
That's less than 1 out of 10 chest.
As for superb runes???? Really????
I've salvaged at least 40, and I still have over 5 of each type in my inventory in reserves.
Superb runes are useless, when you have no weapons to put them on.
And as for Longbow of the Griffon, it is pretty common knowledge that it's the most common high level unique in the game. I'd say it drops just as often as the high level blue weapons. So NO not very good luck at all.
And here's something else to consider when you say "I'm pretty lucky", I have not seen an upgrade or usable item since 400,000 gold spent. That's 250,000 gold spent, without seeing an upgrade or usable item.
That is pretty pathetic considering, I'm still missing about 10 best in slot items.