Oh god! The horror, the horror!
*sits in corner shuddering*
I have a serious problem with this. As a massive trophy whore, then I will more often then not go for 100%, even if doing so turns into a torturous grind. I know its stupid, and pointless, and a waste of time, but I just cant help myself. Games like Assassins Creed (2 and onwards) I'll go get all the viewpoints, buy all the stores, gather collectables, do every sidequest whatever. Sandboxes I dont mind so much, because I do enjoy them. Saints Row 3 I did the same (except for the jumps/barnstorming. No trophy- no point). Hell, I even went for the platinum in FF XIII which meant going for that frigging treasure hunter trophy. In my defence though, that was also to unlock the Fang xmb theme. But damn, I must have killed that Eden Plaza Adaman over 100 times.
I'm trying to get better though. There are some games I will refuse to grind out, just for the sake of it.