I use Opera Mini (or is it mobile?) on my old phone - they have a system that routes request through their own caches that downscales/downsamples images, removes cruft, etc. before the pages hit the mobile device. I imagine that means they get under-represented in hit figures (but not by that much).

Looking at hits is doing it wrong - profit is where it's at, what proportion of profits come from Opera users.

[For example, hypothetically, they might be highly paid trend setters and amount for a disproportionately large profit share on a fashion site or such.]