It depends on the company and their strategy. I hire corporate training managers and instructors. Our company was previously strongly in the Six Sigma camp. Everyone in the company was at least green belt certified (very large, global company). Then we made the transition to Lean - to the point where we aren't allowed to use the Six Sigma terminology anymore. My recommendation is do the research on the company to see what they value. If you're asking in general if it has a positive ROI, I would put it lower on the priority list.
As a hiring manager, I do like to see that people have analytic skills, but corporate trainers aren't running six sigma projects. I'd be more interested in how well you understand human behavior and root cause analysis specific to human error/behavior. That is our target environment in corporate training (training to improve performance).