I'm not a software developer, yet I find it very hard to believe that Avatar is somehow hard-coded into Superior Drummer. AFAIK, you can install the software without installing this library, and you could still use it just fine with everything else. I also find it hard to believe that Avatar, which makes up the bulk (as in >99%) of the product, is a free bonus. At that rate, you might as well give away the whole thing for free.
I'd like to point out that I don't necessarily hate Avatar. It's just that there are other SDX's that sound way better to me. I guess I'll just have to hope that Toontrack is listening and taking these points into consideration.