I think most skillers are overpriced and not generally worth nearly as much as they are going for. Trapper skillers are the only exception that comes to mind. Skillers meta is a thing of past and apart from trappers and maybe fireball sorceress, characters generally don't really need skillers that much. Even more so having 7% FRW skiller is sometimes better than having the one with high life, depending on a opponent.
That being said, I play blizzard sorc with 1.5k PvP damage. Works just fine. So, for ES Blizzard variant, who might actually use skillers, I'd argue she might be better of with life/mana grand charms and few skillers to boost damage than going all on skillers. And for her I'd value 7% FRW pretty much if she has low FRW otherwise.
So... like I said, to me life skillers aren't really worth the money they are going for. I'd rather buy several with FHR and FRW than buying single high lifer just because it is expensive.
Sharing unpopular opinion.