Bashiok posted a totally rad new feature for level 60 Diablo III characters that will make it worthwhile for everyone, including those who plan to sell stuff in the RMAH / normal AH. The Nephalem Valor Buff grants players an increase of Magic find and extra loot from bosses.
This will definitely encourage players to keep playing and playing; and at the same time encourages players to keep their current skills. The buff stays with you until you logout, or change your skills. It's a smart move. You are punished in a way, but you are rewarded big time. I think I heard Rob Pardo mention this philosophy in a World of Warcraft interview about a year ago. Not a totally bad philosophy. Me like.
There are other plans which might take players a bit to digest -- such as not able to swap skills to handle specific boss situations, but we'll see how it plays out. Try first, complain later. Right?
We’re working hard on balancing and testing Diablo III, and one of the major components is making sure that the end game experience is fun and exciting. We’d like to share a few of our goals for end game: We have an enormous number of skill build combinations, and we want a lot of those skill builds to be viable and interesting. While there are millions of skill builds available to players, we don’t want players swapping skills regularly to beat specific encounters as they come up. We don’t want repeatedly running specific three-minute chunks of the game to be the most efficient way to acquire gear for your character. While a three-minute run shouldn’t be the most efficient, we also don’t want you to feel like it’s a two-hour commitment every time you sit down to play Bosses should still feel worth killing Nephalem Valor is one of the major new systems in Diablo III and it kicks in at level 60. Keep in mind that this is still in testing and we’re still working out the details. Here’s how it currently works internally: Rare and Champion packs already have great loot on them. By killing a Rare or Champion pack, not only do you get their loot, but you’ll also receive a buff granting you increased magic find and gold find. However, if you change a skill, skill rune, passive, or leave the game, the buff disappears. As an extra reward, if you kill a boss while this buff is active, you’ll receive extra loot drops from that boss. The exact amount of magic find and gold find provided by the buff is still being reviewed, as is the amount of extra loot you get from a boss while the buff is active. We’re also playing around with whether or not the buff stacks, what the duration should be, and whether or not it should persist through death. We want to make sure the buff is strong enough to make staying in your current game more rewarding than creating a new game. At the same time, if the buff is too strong, it risks making shorter play sessions feel not worthwhile. We expect this system will encourage players to stick with a skill build of their choice, select an area of the game they enjoy, and sweep it for rare and champion packs on their way to a boss, finishing off a run with a boss that’ll be worth killing. If you wanted a shorter play session you could be done at that point, but if you have more time, the path of least resistance would ideally be to stay in the same game and make your way towards the next boss.
Update: Once you hit 60 you have access to this buff regardless of difficulty. You can use it and go back to Hell to help you gear up for Inferno, absolutely.