It goes with the territory, and anyway what would you prefer? An Opera user who may (rarely) selectively block your ads, or an IE user ridden with spyware which is replacing your ads with another network? Those who actively choose to block ads aren't going to click anyway.
How powerful a machine do you have? This is a very cool idea, but is also a sign of bloat - too much fancy stuff which sounds good in theory but is far from essential.
Compared to Opera 8.51, is there really any major change or advance in Opera 9?