The ROCK app works off of the ROCK Development store. Sure, ROCK also serves as a repository access app like Cydia, but that's not where the main focus of the app lies. That honor is reserved for the app store with paid content, and by paid content, I mean apps that used to be free on Cydia are now getting 2.0 versions on the ROCK store that cost money. This raises a few issues:
1. Paid "pirate" apps are of real concern to those people who enjoy not having their credit information stolen or used for other "purposes". Even though the ROCK store supports reliable payment methods, giving out your credit card to this sort of company still seems questionable.
2. These apps used to be free. Sure, I think that the developers deserve to get paid for what they're doing provided it's good, but this sort of store promotes splintering the regular Cydia Repository into paid and unpaid apps. Cydia too has a paid section of the app, but there they offer free apps that can substitute for the paid versions.