I suspect apple will likely not make anything from the enabler.
I bet the 1.99 is priced very close to the per transaction costs of accepting credit cards online. Maybe Apple has enough clout with itunes transactions to squeeze the credit card cos on transaction fees but I suspect that there is really no margin for profit here simply a cover of expences that will be incurred to adhere to accounting. Should they just take their lumps and lose the small amount of money selling the software for a penny (or break the accounting rules and not lose anything)? The answer is YES especially since the only hardware that can use the enaber is all under warranty (at most a few months old) and infact many could even have been sold after it was generally known that there were n cards in them (I bought a macbookpro last week knowing that is was n ready).
Just my 2 cents! note not given to adhere to accounting practices!
Apple Charges Fee for Hardware You Already Have