While the McAfee logos might clarify that all is legal, Ticket Luck is known for price gouging. Quite often they charge a ridiculous markup (meaning HUNDREDS of dollars) more than tickets are worth. After the individual realizes they've been screwed, Ticket Luck hides behind the fact that the tickets are actually supplied by third parties (much like ebay). ALWAYS check the venue prices before purchasing from Ticket Luck - it will save you hundreds!
See tons of complaints here:
http://www.complaintsboard.com/bycompany/ticketluckcom-a*******.html
Bottom line: AVOID TICKET LUCK like the plague.