We've all been there, you need to get X amount of an item from a certain mob and it just doesn't drop, so you sit there spending hours and hours to get like 10 of the things! Why!? Drysc responds:

Item drops are generally a challenge based on time investment. They're not technically unique to MMO's, but definitely a staple of the genre. If you're looking for rationale on "why doesn't every snake have an eyeball?", make up whatever you like (the idea that they must be undamaged is a pretty good one), but the only purpose is to provide a challenge based on an influenced probability reliant on time investment.

You probably just wanted to complain without an explanation though, huh? Sorry.