I see what you're saying, and I agree that the increased supply of commons and rares from other packs will drive their prices down. That makes starter packs a bad investment if the goal is profit. However, from a gameplay perspective, cheaper commons and rares can make it easier for new players to get started and for renting to become more viable.
Do you think this would help retain more players in the long run, or would the devaluation of commons and rares hurt the ecosystem overall?