Rob,

Currently your system awards bonus items for every card used.  So my buddy who wants $50 bucks in cards goes and buys 25 variable load cards for 2 bucks each.  He then gets the bonus items 25 times.  When I go buy just one $50 card I only get one bonus item.

I really think you guys should do it by amount spent not per card.  As of right now there is no incentive to go buy large denominations when you can just buy small amounts and get tons of ADV packs.