That's ignoring the potential loot you get from killing the boss aside from the uniques, though.
According to the wiki without uniques you can expect to net ~38k/kill. This works out to ~30.5m in drops not including any duplicates you could sacrifice to Death's Coffers. If ironmen really only care about getting the uniques then it's more like 10m to complete the set (in your case).
You realize ironmen can't sell items on the grand exchange for gp, right... ?
But you can put them into Death's Coffer and there is a new question that was added to allow for the fees to be paid from there if you'd rather.