Because at end game, Raiding it's really the only thing left to do in WoW
- 5man dungeon runs are boring as all hell after you ran them hundreds of time over at Level 90, plus the gear drops blow, and are outdated.
- Heroic Scenarios are cool, they drop ok gear, but also get repetitive and boring after you done all of them, a bunch of times over.
- Daily rep quests, are insanely tedious, and annoying and super boring, extremely grindy.
- Timeless Isle is a waste after you get all the i496 welfare gear, and after you got the cool higher iLevel gear from Rare / Elites. Plus just sitting and waiting for Rares to spawn is boring as all heck.
Yep, you can just sit around Shrines of Two Moons and look cool, or go dive into a Raid and see where Blizzard spent their development money.