If DomainSite.com offers domains for $6.99, what's so great about a reseller for 4 cents off?
If you want to be in the reseller business, eNom allows you to establish and manage your own network of subaccounts. You can set their pricing, allow them to use an API and integrate turnkey credit card processing. If you have your own large domain name portfolio, eNom's "Magic Folders" allow you to manage them easily.
I think it depends on whether you are truly a reseller, or just looking for a means to buy domains for less.