The system is in place because of the following example:
Person X makes account (reffered to as orig).
Person X makes alternate accounts (alts).
Person X has alts play and get low cost cards
Person X has alts trade all but low cost cards to orig
Person X uses cards to improve deck/sells for clintz
Person X makes profit.
With enough people doing that, the company who runs this would need to shut this game down.
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.