Why cant we just commerce about this?

Ecommerce has evolved exponentially since Tim Berners-Lee invented the first web browser, and opened a new door for businesses across the globe.  Nowadays, almost all of common items found in brick and mortar stores can be purchased online through various companies.  As we take a closer look into a particular website, stores.greygrouptraining.com, we can quickly see that the website deals within the B2C business model.  After more research, the site also uses B2G, due to the nature of the items being sold, and their availabilty/pricing that entices government purchases.  Having more than one business model allows grey group to continue selling product even if one side of their equation is somewhat lacking.