At 60, one of the many things on my to-do list is "grind reputation". I didn't really start caring about reputation before I hit 60 (save for some furbolg slaughter to appease the Timbermaws), so I have had a long way to go with all the game's factions.
The recent Scourge invasion and expansion of Light's Hope Chapel now mean there's even more you can do to get the Argent Dawn to like you. However, I'm torn. I'm saving up for an epic mount, and the various turn-in items (Crypt Fiend parts, Dark Iron scraps, Bone Fragments, etc) are fetching high prices on the auction house. So I've been splitting my spoils -- selling some, and turning in others.
Do you see this as taking advantage of reputation grinders? Or is it merely profiting from the game's mechanics? If I manage to save enough for my mount this way, I'll stop; but I've seen lots of spam in the Trade channel advertising the same items, so it isn't just me who thinks this way.