Most Domainers do not pay the advertised rate because there are many ways to pay a lower price. You can renew in bulk. Right now if you renew more than 20 names at a time it is 9.99 per .com if you renew more than 50 at one time it is 8.99 a .com and more than 100 names at once is 8.29 a .com.
https://in.godaddy.com/bulk-domain-search.aspx?ci=8236
We also offer cheaper pricing through the discount domain club. This offers a lot more than just discounted domains, it also gives you a free auctions membership and cash parking premium (80% rev share), discounted gtlds, and discounted Domain Buy Service claims (we broker a domain purchase for you). It is currently $120 a year. Premium cash parking alone is $129 a year and that is thrown in free. Com renewal prices with that are 8.29, net is 7.99, new tlds are at least 40% off etc. So if you have about 18 or more domains (depending on tlds of course) you can save alot of money. You can also buy it for one year and renew for multiple years at the lower price. Right now we have a coupon for new users for 50% off so it would be $60 for your first year which would break you even at less that 10 domains.
Last but not least, many domainers have an account representative. We are having another google hangout at the end of the money that is focused on what being a part of Premier Services offers you and how you can qualify. If you have more than 250 domains and are spending in the neighborhood of $5,000 USD a year you can qualify. If you are close to that or say spend $10k and have 50 domains etc reach out to me on pm and we will look over the account. One of the benefits of premier services is offering better pricing to our top customers on renewals and privacy. This is open to anyone who meets the requirements and you can find out a lot more by watching the hangout this month either live or on youtube. I will post a link to it under the news section later this month.
If you are interested in the domain discount club and want to try it out with a special forum discount for the first year let me know as well through pm. I will give you the code if you use it only for personal use, if you share it on a blog or email chain etc it will be cancelled and you'll ruin it for everyone else so please use it only on your personal account without sharing so others can take advantage of it as well.
If you are interested in learning more about it, we did a hangout covering it, the first ten minutes go over all the benefits, http://no_url_shorteners/newgs
Also one of the biggest benefits of registering/renewing with Godaddy is the sales network you are a part of. We have a giant sales network you should be listing your domains on. Taking advantage of our sales network to list your names for sale should result in more sales which would more than cover any renewal cost differences. Of course, this varies, if you have a poor portfolio then it will be hard to sell names. But on all these things I am here to help. We did a hangout on listing names the best way to generate sales and also an article on buying names for profit. I have another one coming out on finding good names in the Aftermarket in general with more specifics coming in November on another hangout where I will walk people through finding names they can resell.