Worth mentioning that the "10% raid attendance" is to OBTAIN unlimited bid (Knight) status. Not to maintain. If you're casual but can find a month to go a little hard, you can hit Knight and you're good for life!
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My monk is a Grunt currently, and has thus far gotten the LTK mace, HoT legs, Eyepatch from Kael, and his epic as "raid" loot (epic drops don't cost DKP by the way). I'd also be eligible for lesser NToV gear, HoT arms, POSSIBLY the BP, and I've seen Plane of Sky boss loots for monk at grunt-level DKP as well.
So it's not hard to be a "casual" raider and still gear yourself out very well in Kingdom. But it's also not that hard to hit the 10% RA, especially with things like a ring war counting as 3 raids in the system, and get yourself those big, sexy drops.