Group-buying is not a natural monopoly, yet there is a limit to how many group-buying websites consumers will use.

FORBES: Online Group Buying's Need For Speed

Like Fast Track, The Signature Lounge has also used "group-buying" websites to help boost sales.

BBC: Mall v internet: Can ecommerce conquer the Middle East?

Likewise, for the time being, any increasing revenue seen by using group buying or local commerce websites is also excluded - even when the payment is actually made through the Internet.

BBC: Mall v internet: Can ecommerce conquer the Middle East?