MP consistently does specials on bb.com as well as huge discounts. The reason they had to restate revenue was because of the cash back discounts to distributors. It's also why their margins plunged.
The thing w bogos is if you can get consumers to buy one get one of your product , then hopefully they see the value in the product and continue to buy in the future at regular price. That's how you gain market share. Yah your cutting your own throat at the same time but your also cutting your competitors.