Why No iTunes Live?

Just going quickly through the upcoming Boston concerts listed on TicketMaster, but was disappointed to discover that all four bands I'd like to see live in the next two months are already sold out. Was also disappointed to see that Nickelback can actually sell out venues.

Kinda makes me wonder why iTunes hasn't already formed a partnership with Ticketmaster to let users opt-in to an alert program which gives iTunes listeners a head's up every time they log in and tickets to bands in their downloaded history have gone on sale. Seems like it would be highly on-brand for Apple and generate faster ticket sales for TM. Electronic downloads are wonderful, but why not enhance the offering with a few real shows?