I think you would end up flooding the market with secondary cards that are discards from the 'collectors' and your $30 main pack would end up looking really over priced. To prevent this the boosters would need to contain cards not found in the main pack.
That a good point. In Magic: the Gathering, a lot of common, uncommon and junk rares come in bulk for cheap. Perhaps there could be a US$20 set of rares and ultra-rare cards, and a separate US$10 set of commons and uncommons?
CCG distribution is hard... >___<