MrHappy interview with Yoshi-p (Raid boss tiers, set bonuses)

[Ririta]

You can't just look at one piece of content and say "more people collect glamour! So that's clearly all the should focus on." WoW has similarly low percentages yet they still hype up their raids each expansion.

That's not what I'm doing at all. I'm saying that raiding is niche and bribing people into doing them won't actually increase the numbers.

And if you're gonna use WoW as example, the lack of things to do outside of raiding was a common complaint from Cataclysm and forward.