I'm not high enough level to be that guy, but I do help out whenever I can - mostly for kicks. :) I've taken quite a few newbies under my wing - enough that they're almost all higher level than I am, now!
Everytime I help someone out and they threaten to repay me, I make sure to tell 'em they owe whatever time and gil I've given them to the next newbie they run across when they're my level. Pay it forward, as they say. ;)
And for those who don't help others in need, here's my karma story: I went off to get my Palb Chest Key for Khazam, last night. Got there, asked for directions, and a 45 DRK and 60 DRK led me to the appropriate Quadavs - killing all of them for me, on the way. :) About 10 kills, and we got 2 keys. Thanks a ton to Kane and his friend whose name I can't spell, on Fenrir! Half an hour later, my PLD bud Ruvardal offers to break out his 30 WAR and take me to Giddeus. After getting lost a few times, we find the room. 5 kills, Giddeus Key. :) Total time spent (including travel time), 2 hours. Khazam, I'm coming! Yeah, I cashed in all my saved up karma, last night, but it was worth it!