Personallly I think Terrene is a pretty well-known word. However, I do have to agree with you, namewaiter, maybe people don't really know how to spell it (even I need to look it up to confirm), but they will know the meaning when they hear it. Afterall, terrene isn't a SAT word.
The reason I purposed $8000 is because there are companies interested in the domain. There are also a lot of other companies out there which I am in the process of contacting that has the word Terrene or is operating their business related to the terrestrial.
I could be wrong of course, but I do believe this name could be more than what I have set for the current buy-it-now price.
Thanks.