No problem.
I, myself, have attempted to compare Ramparts to Blood Furnace. Ramparts seems easier, at first, but in terms of profit, it is diminished.
Why?
Well, for one, it should take you, generally, nearly as long as a correctly done Blood Furnance run and the only area with condensed packs of mobs (which is what mages need) are in the starting areas. From there on, the pulls are more or less very small and thus, take twice the time, since you expend the same amount of mana, usually, taking out a small pack compared to a big pack.
But I do know classes, such as Prot Paladins, DKs [not sure post-death strike nerf and Warriors using Frenzied Regen a lot] can do this.