Currently apps in the ROCK and Cydia stores are priced anywhere from $0.99 all the way up to $11.99. Of course, this is a little skewed because the priciest apps are the ones that people usually want the most, such as the iBlacklist app or the Intelliscreen app. This leaves the cheapest apps to be the ones that barely sell and are quasi-worthless, such as a $0.99 app that just flashes LEDs across your screen.
The only exception to this rule are those $0.99 apps that are actually themes and those are priced pretty high as well since most of the themes available on Cydia are free and some even rival the paid themes on the ROCK store. Overall, the pricing on the ROCK and Cydia stores need a severe readjustment before they can break into the mainstream appeal of the regular App Store.