1.) I have the "it has to drop" problem.
Even if it's a lowrate I'm playing, after couple hours of farming (if the said item didn't drop) I'll still be stubborn sitting there playing, because I feel like the next day my monster kill count will reset and I'll have to go through thousands of them again (half of my brain is aware it doesn't make sense, since it's pure luck, but fails to explain it to the other half).
So basically, when I quit for a day without obtaining it I feel like I wasted my chance.
2.) Even on high-rate servers, I can't help myself but do full novice grounds. Nostalgia.