ISTR the strict letter of the small print for Live was that you got a year's sub to the service bundled with headset - the charging part was always an integral part of the plan, hence the need for a credit card when signing up but the sub was waived for the first year.
Of course, there's also all sorts of speculation that this is also to enable a payment system for all manner of other premium services - game content, music etc.
Of course, there's also all sorts of speculation that this is also to enable a payment system for all manner of other premium services - game content, music etc.