Depends. is it in good standing?
It's a big advantage if you're using AdSense ads on your videos. Your videos will be imediately approved for using ads on them. If it was a new account, you'll have to wait until YouTube approves your videos, which is pain in the a**, because you have to submit all kinds of documents to them to prove that you have the right to use the video and the audio!
I think a lot of people doing YouTube AdSense would be interested in buying your account.