I’ve been paying for it for the last year or so. Whatever the mid level is. Part of the value is that I’m not reminded of what I filtered out—which is a double edged sword. But when I find myself on someone else’s device that defaults to Google or Bing, I do see the difference (again).
Have you checked out mice marketed for gaming? Particularly for MMOs, you’ll find a few 10+ button mice. I’ve been a happy user of Logitech’s line up, for what it’s worth.