Access points are like doorways into your network environment. Fewer doors left open means less traffic to filter. Any traffic to restricted doorways is simply unwanted and can be rejected. Traffic through open doorways is therefore easier to filter, but cannot go without diligent surveillance.
In a virtual world in which the majority of hacking attacks are received through open doorways, your Network Security Administration is more important than ever. How secure is your PHP eCommerce website and the web server it's hosted on? Is your MySQL Database Security sufficient?