Is it? I find that odd since the stat increase from R to SR is really small. I guess the impact from the skill is very small then (outside of Affliction+).
I know there is a calculator for it, but I haven't bothered to toy around with it yet.
Either way, Rs are extremely cheap to enhance. Getting at least the first four Hime per element geared up in basic Accessories should be well cost-productive. Especially since even remotely useful SRs are so bloody hard to come across.