Sometimes the opposite is in fact the case and a higher SAC can mean a better diver.
For example, if I am in a cave at 130 ft, I'd prefer not to be with a diver skip beathing to try to push the penetration a little farther and/or not be the guy who turns the dive. Skip beathing would likely mean he is more impaired by narcosis. Also, if the bottom were silty and there were low duck unders over a clay silt bottom, the odds are much greater that he will contact roof or floor due to an unwillingness to use lung volume to fine tune his buoyancy - as that will screw up the skip breathing pattern and use more gas - and silting out the passage may result.
So...If I lead our hero in and he skip breathes, at max penetration when the dive is turned, he will be at thirds, (maybe even busting thirds if he is a real idiot) will have elevated CO2 levels, more pronounced effects of narcosis, will be in O2 debt and we may both now have a couple thousand feet of silted passage to navigate on the way out. In that case our hero here will most likley be cutting well into "my" reserve third of his back gas. If something happens to my gas, there won't be enough of his for both of us.
In the end, I don't really care what his SAC is, I wouldn't dive with him again. That may not have been the case if he had breathed normally, had perfect bouyancy in a sawtooth section of cave, and turned the dive a few hundred feet sooner - all possible signs of a "better" diver that are not associated with an extremely low SAC.
It goes without saying that when I first meet a diver, if one of his self proclaimed strenghts is a real world swimming SAC below .6 and "he" is not a 98 lb female and/or if a low SAC is an obsession with him, the warning bells start ringing.
