lvl 68 campaign dungeons and lvl 5 crystaloids

[Linazz]

I've noticed something here; wanna see if it's just coincidence or not.
So i did the 68 campaign dungeons a few times to finish the quests and all... Doing this i got 2 l5 crystaloids.
Since then i only blitz them due to lack of time. Here i got 0 crystaloids in a few days. Is that just bad luck?
I was just wondering...

[Evilmog]

I'd vote bad luck. In the lvl 60 instance I get 1 lvl 5 crystaloid every 2-3 days (16-24 blitzes)

[Linazz]

kk thnx