The proposal is flawed from a financial perspective to Apple.

Credit card fees are higher as a percentage of the price, the lower the price. Apple pays close to 30% to credit card companies for a one dollar transaction, whereas a hundred dollar transaction costs just a few percentage points. (I think this is due to a fixed per-transaction fee added to a percentage-based fee.) This is why retailers often place transaction minimums for credit-card purchases.

It's to Apple's benefit to consolidate multiple app and music purchases into one transaction to reduce the total percentage paid out. They do this by offering iTunes gift cards for sale at stores and by consolidating multiple purchases from the same day or two into one transaction.