I understand that you are trying to make the argument that Being special is subjective, I just fail to see what it has to do with the earth being special. Since we are the creatures that came up with the concept of "special", its pretty clear that we are in fact special.
This is the kind of cheap philosophy or word game that makes a site like this one possible. Contemplate two scenarios: the one in which you attribute the word "special" to life, or to Earth, or to the color of your mother's hair. And the one in which each of these things is called "common".
The two scenarios are exactly the same. You will not have a different set of knowledge to understand them, you will not have different laws to explain physics or biology or even psychology. In short, you have nothing new, except maybe something to talk with friends.
Something about these scenarios is bothering me. The first being that my mom's hair color is not special. In fact, many many people on earth have it.
In the second scenario, Life, which I have not been talking about generally, i have been talking about intelligent life, gets labeled as common. Seeing as how most scientists in RET don't think this is biologically likely, I would say that it appears that you have something new if you believe this to be the case.
Lets just be frank. In RET, the evolution of intelligent life is a rare and special even for the earth. Even if there are many other intelligent beings out there, the ratio of them to the number of planets total would be minuscule, thereby making it special.
And I am pretty sure that the world of RET scientists would agree with me, even if they don't do so currently. If you honestly believe that the discovery of a new planet would carry as much wieght as the discover of a new type of life form, intelligent or not (and if intelligent then bygolly) then you are just buying into this subjective mumbojumbo too much.
Of course being special is subjective to what humans think is special, but should we try to make it subjective to what rocks or planets think? By our definition of special, Intelligent life is just that. This makes the earth just as special, as it is the home of intelligent life.