Yes, very true. Some games I'm fine with looking around for collectibles, if it's a game I want to enjoy more than just rushing through it like I usually would. In other cases, there are way too many collectibles/the collectibles suck and I want to use a guide for them, or just skip them entirely if they reeeally suck.
Hmm well I just finished a challenges guide for the ghost recon: future soldier dlc. Not sure if we'll be including challenge/difficulty guides or not yet though. Other than that I'm organizing the list of arcade games that have guides/need guides/etc and posting that in the guide team forum.