Hmm.... you don't get the godaddy emails telling you the renewals are coming?
I have over 500 domains at godaddy and I keep all of them on auto renew just in case I get sick or something. I don't wont to risk losing a domain over a measly renewal charge.
Then when I start getting the renewal notices I go in and look at my stats, how many offers, how many visits etc and I disable the auto renew on the ones I don't want to renew. Then I renew all the domains for the month so I only have one invoice to track for tax purposes.
Domain Discount club keeps things fairly reasonable but I could move another 1000 domains into godaddy if they just made the wholesale price standard to domainers. Right now I have good deals elsewhere that beat godaddy even with discount club and that makes me think I may not be renewing, which unfortunately would mean me finding another home.
Discount club should be free for those with over 500 or 1000 domains. It's kind of a joke to have to buy that to just get remotely close to other companies pricing.
I have to say though.... the ease of auctions and the fact that anyone I do business with has a godaddy account does keep me with them for now.