I think that rings true for most self-hosted eCommerce applications though (or any self-hosted application written in PHP), not just Magento. In the right hands

I think that rings true for most self-hosted eCommerce applications though (or any self-hosted application written in PHP), not just Magento. In the right hands Magento can be tuned to handle hundreds and thousands of orders a second if you want it too. If Wordpress can scale, Magento can scale too. We used it to build a large online shoe store here at my employer and it seems to handle the traffic quite well, AWS is a godsend.