Start offering live chat services to new & existing web hosting customers. White label so it can appear to be operated by your business. There is no minimum/maximum resell price - sell it for the profit you target.

You can choose to let customers manage their own chats, or you can bill them extra to manage their chats as well. For a free trial, and to learn more about the reseller program for web hosting providers, see:
http://gotlivechat.com/reseller-whitelabel.asp