$8 USD for an expiring domain?
You probably paid $10 for it and only want to take a $2 loss for 11+ month use.
Chances are that if you are selling it, you won't be renewing it. For that, why should I not wait 1 month, spend $2 more and get 12 months rather than a few weeks for $8 and then need to spend $10 on its renewal. In the end, I save $8 for waiting 1 month.