It's only 1.5k/hr more, so short term gains are marginal. But over the course of the skill, you can expect to save roughly 30 hours.
(This is literally all made up, but you have so many extra toes, just try it out) ((Also ignore that they added a tired mechanic so you can't AFK mine it anymore, that'll get reverted. You wanna be ready for when it comes back, detach that sucker))
Well that sure is an article I never expected to read.
But I also think Jagex should have given it a more firm "No". Or at least a "Please don't". Depending on how long it takes to grind mining and what the potential reward is, I can see one or two people going for this without having their appendages removed for actual medical reasons.