Fair question. For me, it has zero to do with my fighting skills and everything to do with the fact that all my good friends are BJJ black belts, so I'm hoping if anything goes down they can protect me while I guard the beer. Plus, we're all in our 40's or 50's and are home by the time the loudmouths show up.
All kidding aside (I'm also a BJJ black belt), it has increased the odds I can handle someone, but doesn't guarantee anything. There are some skilled, young hotheads out there that I'd definitely avoid.
Consistency: It's only a virtue if you're not a screw-up.