With the live support email support is also helpful. If they have some problem with live chat Or as a new company, if they have fewer employees to live chat with, then emailing to Email Support is also important. Or anyone can post their problem in this forum for any help. In that case too he will get help. Because here too they have an official moderator for monitoring this thread.
Lets just say that email support is default for all business sites to have for their customers to contact and my opinion about live support is the sites have it to help their customers on in time or as the name goes LIVE which means they help the people who have problems live/on time instead of sending emails and wait to receive a reply/response from the site after inquiring them about the situation/problem that a person is having on the site.