I'd be careful. I think tickets are useful in keeping records of technical issues or disputes and in cases where there's no one waiting to answer someone's live chat request.
Must agree, tickets is a lot easier to manage rather than 30 live chats, you cannot do them all at once, consider the positives and negatives.
I am using WHMCS live chat addon currently, the program for the Computer seems very sleek and is fun to use, the front end needs to be re-done however.
We find tickets useful, because it does keep track of support requests and whatnot. However if you're looking for a live chat software, definitely check out Zopim!