DRK is often the most profitable X11 coin to mine. Why do you think multipools mine it?
And 'two-tier' is needless rhetoric. 'Two-fold' would be better - I think miners are important, believe it or not (I am one, remember) but I think the whole 'securing the network' thing is overestimated and overassumed, and what little security they do provide is currently too expensive.
Enforce p2pool and mining suddenly does help make the network secure. Right now, it simply doesn't.
Won't you just get the same centralised thing happening with masternodes ? Masternode farming and half the coin supply locked up, no liquidity ?
I'd rather have centralised mining than centralised masternodes. They are a value added service. Think supermarkets:
[1] - mining=stocking the shelves
[2] - masternodes = carrying your stuff home for you
Your saying that the prices on the shelves should reflect the cost of the delivery service, even for folk who bring their own bags and cart their stuff home.
And b.t.w. 2-tier is EXACTLY the right terminology, not 2-fold. By any interpretation of software architecture, Darkcoin's anonymisation layer is a completely separate tier, both conceptually and literally.
I'm really intrigued by this whole MN + Mining + DRK Cold Storage + Instant TX + Random Selection, thing.
It seems to provide an adaptive network.
They are really something else beyond crazy! 
