I agree with the above. Also, keep in mind that you are allowing your domain to age which to us that email market, is worth money.
I have about 50 .co domain names. Really good names. I'll renew then as long as 1)They pay for themselves or 2)Still have value come renewal time.
I'm not sure how excited folks would be to get your domain (#2), but it sounds like you have #1 taken care of.