First loyalty, and the possibility of some customers moving to Econet because of the bundle attraction. Remember its not ALL users that will be sending videos like crazy. Many will probably not even send any attachments at all, so it probably all balances out. As for facebook, consider all the external stuff which appears in your timeline, and then when you click to open it, it takes you to another page. You pay regular dollar for that. With Econet being one of Zim's most profitable businesses, I'd imagine they are still at the advantage, just maybe not as much as they would normaly be, but there is still a percieved benefit for them. Thats the nature of MOST PROMOTIONS I guess. Even a sale at Edgars - sacrifice margin for volume.