I sort of remembered that but then I told myself I was getting carried away on my anti-monopolistic rhetoric and exaggerating the issue, and it didn't seem important enough to pause and research the issue :)

Honest question, why has nobody gone after them for monopolistic practices?

hard to say, as i haven't dug into it at all. on the face of it, using their stronghold in venues/marketing (livenation) to get their way on ticketing (ticketmaster), or vice versa, seems like it would be ripe for abuse as well as regulatory scrutiny.