(Sorry if this question looks silly.) I see that many popular hosting companies still offer (primarily) a 100mbps network switch - Hostgator and Rackspace are good examples. While very few exist that offer a gigabit uplink connection - mediatemple for example - large companies (like Softlayer, probably the only company) even offer 2Gbps and 10Gbps ports .
But all this does make sense to me. How is this going to affect the performance of a website or server? How should someone know if they require more than 100mbps?
Consider a wordpress blog receiving 40-50 million page views a month and a single page size of 1.5mb. Does it require a 1Gbps uplink?