Just crossing the Sedo sales wire is the domain name Bitcoin.me which just sold for $10,000
The domain was registered in July 2010.
The buyer is Help.org and the domain is being forwarded to Millybitcoin.com
Bitcoin.biz sold for $2,800 in March 2013, Bitcoin.im sold for $1,500 in February 2013, Bitcoin.be sold for $1,950 in January 2013.
On the other hand Bitcoin.us sold for $17,500 in December 2012 and BitCoin.de sold back in June 2011 when a lot few people had every heard of it and it was trading for less than $10
So if anything I think the domain sold a little to cheap especially since the price of a Bitcoin has risen many times over since these other sales took place.
Bitcoin is currently trading around $750