It costs 23,500 valor to get a full set of ilevel 489 gear. That's a 489 piece in every slot, aside from weapons/offhands. If you use the cheap 476 crafted chest/hands, it's only 19,500 valor. That's five months of capping. You can further reduce that with a DMC. And while five months of valor may seem like a long time, remember that that's less than the time that most tiers are current. And I'm only talking about guaranteed sources of loot - so not Sha or LFR - and also ignoring PvP, the purple weapons from heroics, and stuff like the engineering head and the inscription offhand.