Opera users tend to be heavy and long-time Web users. Which is exactly the definition of people who don't even notice banners.
I totally concur. While I bought an Opera license about 6 months ago so I wouldn't see the darn banners - I didn't notice them and certainly never clicked on them for the 12 months I used the free version. The only time I noticed them is when they stalled loading a new banner - it locked up my system.