Players spent $225 each to raid SoO (15 months at $15 each). That's 1.46 billion dollars assuming 6.5m subs. SoO probably didn't even cost 1/100th of that. This is a subscription based game. If they are going to throw out "mini-expansions" they should be free. I already feel paying for expansions doesn't make sense but do they really expect people to pay $15/m and $50/year at the same time?
What's the point of our monthly fee if we have to spend $50 on 2 raid tiers?