No, resellergenie is not a reseller of resellerclub.. they use Logicboxes, which is being used by number of other domains registration service providers. These companies do make profit, some of such companies have special rates from their upstream service providers enabling them to offer better/low price.
I'm a reseller of resellone and until now there is no issues here. Prices start at $6,49. You only have to make a minimal payment of $100 and sign a contract to start reselling domains.