Correlation doesn't imply causation. You can't honestly expect that John Q. Public is going to be as successful as a Chrome team member for getting a bug accep

Correlation doesn't imply causation. You can't honestly expect that John Q. Public is going to be as successful as a Chrome team member for getting a bug accepted; I've seen many of the bugs that get filed for Chrome, and I'd say a fair amount of them are by non-technical users. I'd be willing to bet that if you took any non-trivial project and ran the same metrics on the bug DB for developers vs. QA, you might get about the same results. When a dev puts a bug in, more times than not, it's a bug. But when QA puts one in, there's a very good chance that they're either mistaken about the expected functionality, or are reporting a bug that's already been fixed in trunk.